#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < (long long)n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int main() {
    string s, t;
    cin >> s >> t;
    sort(ALL(s));
    sort(ALL(t));
    cout << (s == t ? "YES" : "NO") << endl;
}