/**
*    author:  boutarou
*    created: 02.08.2020 12:19:32
**/

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < int(n); i++)
using ll = long long;
using P = pair<int, int>;

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