#include <bits/stdc++.h>

using namespace std;

int main() {
    int alp_a[26] = {};
    int alp_b[26] = {};
    string A, B;
    cin >> A >> B;
    for (int i = 0; i < A.size(); ++i) {
        alp_a[A[i] - 'a']++;
        alp_b[B[i] - 'a']++;
    }
    for (int i = 0; i < 26; ++i) {
        if (alp_a[i] != alp_b[i]) {
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
}