#include <bits/stdc++.h>
using namespace std;

int main() {
    string A, B;
    cin >> A >> B;
    
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());

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

    return 0;
}