Hello everyone; I have been grappling with 3 cases that are not passing. The difference is so subtle with a digit change. I tried JavaScript notations for very large numbers or scientific notations but of of no avail. The challenge is linked here.

The different test cases are here.

console.log(separateNumbers("90071992547409929007199254740993")) //Gives NO although it should give "yes"

console.log(separateNumbers("90071992547401929007199254740193")) //Gives YES when 9 replaced with 1//

My code goes like:

function separateNumbers(s) {
var beautiful = true;
for (let len = 1; len < s.length; len++) { 
    var first = s.substr(0, len);
    var num = s.substr(0, len);
    if (s.length <= len) {
        continue;
    }
    var sNew = ''.concat(first.toString());
    while (sNew.length < s.length) {
        num++;
        sNew = sNew.concat(num.toString());
    }
    if (sNew === s) {
        console.log('YES ' + first);
        beautiful = false;
        continue;
    }
}
if (beautiful) {
    console.log('NO')
}

}

Your helps are very much appreciated. Thanks many