#include <bits/stdc++.h>

using namespace std;

#define VSORT(v) sort(v.begin(), v.end())

int main() {
    string A, B;
    cin >> A >> B;
    VSORT(A);
    VSORT(B);
    cout << ((A == B) ? "YES" : "NO") << endl;
    return 0;
}