function convert(input) {
    alert('Error.  Contact us if this keeps happening.');
    document.getElementById('modal-contact').classList.add('show');
    }







    var _ctN2W = {
        ones: ['zero','one','two','three','four','five','six','seven','eight','nine','ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen'],
        tens: ['','','twenty','thirty','forty','fifty','sixty','seventy','eighty','ninety'],
        scales: ['','thousand','million','billion','trillion','quadrillion']
    };

    function _ctN2WUnder1000(n) {
        n = Math.floor(n);
        var parts = [];
        var h = Math.floor(n / 100);
        var rem = n % 100;
        if (h > 0) parts.push(_ctN2W.ones[h] + ' hundred');
        if (rem > 0) {
            if (rem < 20) parts.push(_ctN2W.ones[rem]);
            else {
                var t = Math.floor(rem / 10), o = rem % 10;
                parts.push(o > 0 ? (_ctN2W.tens[t] + '-' + _ctN2W.ones[o]) : _ctN2W.tens[t]);
            }
        }
        return parts.join(' ');
    }

    function _ctN2WIndian(intStr) {
        var out = [];
        // Split strings to preserve integers beyond JavaScript's safe integer range.
        if (intStr.length > 7) {
            out.push(_ctN2WIndian(intStr.slice(0, -7)) + ' crore');
            intStr = intStr.slice(-7);
        }
        var n = parseInt(intStr, 10);
        var lakh = Math.floor(n / 100000);
        var thousand = Math.floor(n / 1000) % 100;
        if (lakh) out.push(_ctN2WUnder1000(lakh) + ' lakh');
        if (thousand) out.push(_ctN2WUnder1000(thousand) + ' thousand');
        if (n % 1000) out.push(_ctN2WUnder1000(n % 1000));
        return out.join(' ') || 'zero';
    }

    function _ctN2WIntStr(intStr) {
        if (!intStr || intStr === '0') return 'zero';
        if (intStr.length > 18) return null;
        var system = document.getElementById('n2w-system');
        if (system && system.value === 'indian') return _ctN2WIndian(intStr);
        var groups = [];
        var s = intStr;
        while (s.length > 0) {
            groups.unshift(s.slice(-3));
            s = s.slice(0, -3);
        }
        if (groups.length > _ctN2W.scales.length) return null;
        var out = [];
        for (var i = 0; i < groups.length; i++) {
            var g = parseInt(groups[i], 10);
            if (!g) continue;
            var scale = _ctN2W.scales[groups.length - 1 - i];
            var part = _ctN2WUnder1000(g);
            out.push(scale ? (part + ' ' + scale) : part);
        }
        return out.join(' ');
    }

    function _ctN2WMode() {
        var el = document.getElementById('n2w-mode');
        return el ? el.value : 'standard';
    }
    function _ctN2WCurrency() {
        var el = document.getElementById('n2w-currency');
        return el ? el.value : 'dollars';
    }

    function _ctN2WCurrencyNames(code) {
        switch (code) {
            case 'pounds': return { major: 'pound', majorPlural: 'pounds', minor: 'pence', singleMinor: 'penny' };
            case 'euros':  return { major: 'euro',  majorPlural: 'euros',  minor: 'cents', singleMinor: 'cent' };
            default:       return { major: 'dollar',majorPlural: 'dollars',minor: 'cents', singleMinor: 'cent' };
        }
    }

    function convert(input) {
        var raw = (input || '').trim();
        if (!raw) return '';
        raw = raw.replace(/[, _]/g, '').replace(/[£€\$¥]/g, '');
        var negative = false;
        if (raw.charAt(0) === '-') { negative = true; raw = raw.slice(1); }
        if (raw.charAt(0) === '+') raw = raw.slice(1);
        if (!/^\d+(\.\d+)?$/.test(raw)) return 'Please enter a valid number.';

        var dot = raw.indexOf('.');
        var intPart = dot === -1 ? raw : raw.slice(0, dot);
        var fracPart = dot === -1 ? '' : raw.slice(dot + 1);

        intPart = intPart.replace(/^0+/, '') || '0';

        var mode = _ctN2WMode();

        if (mode === 'cheque') {
            var names = _ctN2WCurrencyNames(_ctN2WCurrency());
            var majorWords = _ctN2WIntStr(intPart);
            if (majorWords === null) return 'Number too large for cheque mode.';
            var cents = '00';
            if (fracPart) {
                cents = (fracPart + '00').slice(0, 2);
            }
            var majorLabel = (intPart === '1') ? names.major : names.majorPlural;
            var out = _ctTitleCaseFirst(majorWords) + ' ' + majorLabel + ' and ' + cents + '/100';
            return (negative ? 'minus ' : '') + out;
        }

        var intWords = _ctN2WIntStr(intPart);
        if (intWords === null) return 'Number too large.';
        var out2 = intWords;
        if (fracPart && /[^0]/.test(fracPart)) {
            var digits = [];
            for (var i = 0; i < fracPart.length; i++) {
                var d = parseInt(fracPart.charAt(i), 10);
                digits.push(_ctN2W.ones[d]);
            }
            out2 += ' point ' + digits.join(' ');
        }
        return (negative ? 'negative ' : '') + out2;
    }

    function _ctTitleCaseFirst(s) {
        if (!s) return s;
        return s.charAt(0).toUpperCase() + s.slice(1);
    }

    function _ctN2WDetectSystem() {
        try {
            var locale = navigator.languages && navigator.languages.length
                ? navigator.languages[0] : navigator.language;
            if (!locale) return 'international';
            var groups = new Intl.NumberFormat(locale, { useGrouping: true })
                .formatToParts(123456789).filter(function(part) {
                    return part.type === 'integer';
                });
            return groups.length === 4 ? 'indian' : 'international';
        } catch (e) {
            return 'international';
        }
    }

    function _ctN2WInit() {
        var system = document.getElementById('n2w-system');
        if (system) system.value = _ctN2WDetectSystem();
        function updateCurrencyVisibility() {
            var cur = document.getElementById('n2w-currency-wrap');
            if (cur) cur.style.display = (_ctN2WMode() === 'cheque') ? '' : 'none';
        }
        ['n2w-mode', 'n2w-currency', 'n2w-system'].forEach(function(id) {
            var control = document.getElementById(id);
            if (control) control.addEventListener('change', function() {
                updateCurrencyVisibility();
                var input = document.getElementById('box1');
                if (input) input.dispatchEvent(new Event('keyup', { bubbles: true }));
            });
        });
        updateCurrencyVisibility();
    }
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', _ctN2WInit);
    } else {
        _ctN2WInit();
    }




var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}