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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
function luckyString(s) {
	var str_len = s.length;
	var count_ar = [];
	for (var i = 0; i < str_len; i++) {
		var first = s[i];
		var counter = 0;
		for (var j = 0; j < str_len; j++) {
			if (first === s[j]) {
				counter = counter + 1;
			}
		}
		count_ar.push(counter);
	}
	count_ar.sort();
	console.log(count_ar);
	var result = count_ar.every((val, i, arr) => val === arr[0]);
	if (result === true) {
		console.log("YES");
	} else {
		if (result === false) {
			count_ar.shift();
			result = count_ar.every((val, i, arr) => val === arr[0]);
			if (result === true) {
				console.log("YES");
			} else {
				console.log("NO");
			}
		}
	}
}
luckyString("aabbc");
</script>


<script id="jsbin-source-javascript" type="text/javascript">function luckyString(s) {
	var str_len = s.length;
	var count_ar = [];
	for (var i = 0; i < str_len; i++) {
		var first = s[i];
		var counter = 0;
		for (var j = 0; j < str_len; j++) {
			if (first === s[j]) {
				counter = counter + 1;
			}
		}
		count_ar.push(counter);
	}
	count_ar.sort();
	console.log(count_ar);
	var result = count_ar.every((val, i, arr) => val === arr[0]);
	if (result === true) {
		console.log("YES");
	} else {
		if (result === false) {
			count_ar.shift();
			result = count_ar.every((val, i, arr) => val === arr[0]);
			if (result === true) {
				console.log("YES");
			} else {
				console.log("NO");
			}
		}
	}
}
luckyString("aabbc");</script></body>
</html>