#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)s; i < (int)e; ++i)
#define all(a) (a).begin(), (a).end()

const ll mod = 1e9 + 7;

int main() {
    cin.tie(nullptr);
    
    string A, B;
    cin >> A >> B;
    
    sort(all(A));
    sort(all(B));
    
    if (A == B) cout << "YES\n";
    else cout << "NO\n";
}