#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

int main() {
    string A, B;
    cin >> A >> B;
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());
    string ret = "NO";
    if (A==B) { ret = "YES"; }
    cout << ret << endl;
    return 0;
}