#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    string S, T;
    cin >> S >> T;
    sort(S.begin(), S.end());
    sort(T.begin(), T.end());

    S == T ? cout << "YES" : cout << "NO";
    cout << endl;

    return 0;
}