#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main() {
    string A, B;
    cin >> A;
    cin >> B;

    sort(A.begin(), A.end());
    sort(B.begin(), B.end());

    if (A == B) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
}