#include <iostream>
#include <vector>
using namespace std;
const int AL_N = 'z' - 'a' + 1;

int main() {
    string a, b;
    cin >> a >> b;
    vector<int> a_num(AL_N, 0), b_num(AL_N, 0);

    for (char c : a) a_num[c - 'a'] += 1;
    for (char c : b) b_num[c - 'a'] += 1;
    if (a_num == b_num) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
}