importPackage(java.io);
importPackage(java.lang);
 
function isNumber(a) {
	return !isNaN(+a);
}
 
function swap(arr, i, j) {
	[arr[i], arr[j]] = [arr[j], arr[i]];
}
 
function sort(str, i = 0, j = 1) {
	let res = [...str];
 
	for (let i = 0; i < str.length - 1; i++) {
		if (!isNumber(res[i])) continue;
		for (let j = i + 1; j < str.length; j++) {
			if (!isNumber(res[j])) continue;
			if (res[i] > res[j]) {
				swap(res, i, j);
			}
		}
	}
 
	return res.join("");
}
 
let str = "a12j305f20a";
let str_ = sort(str);
console.log(str_);
 

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