#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>;
using namespace std;

int main() {
    string A, B;
    cin >> A >> B;
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());
    cout << (A == B ? "YES" : "NO") << endl;
}