/*
    https://yukicoder.me/problems/no/69
    No.69 文字を自由に並び替え
*/
#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    string a, b;
    cin >> a >> b;
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());

    cout << (a == b ? "YES" : "NO") << endl;
}