function bearTrap(L, D, X) {

    var ans,
        xes = [];



    if (typeof(L) != 'number' || typeof(D) != 'number' || typeof(X) != 'number') {
        console.log('L, D and X should be numbers')
        return;
    }



    for (var i = L; i <= D; i++)
        isSumOf(i, X) ? xes.push(i) : '';

    function isSumOf(n, x) {
        var chars = n.toString().split(''),
            sum = 0;

        chars.forEach(function(el, i) {
            sum += +el;
        });

        if (sum === x)
            return true;

        else
            return false;
    }



    var min = Math.min.apply(null, xes),
        max = Math.max.apply(null, xes);

    ans = [min, max];



    return ans;

}

var answer = bearTrap(0, 10000, 24);

console.log(answer);