#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

int main() {
        string a, b;
        getline(cin, a);
        getline(cin, b);

        sort(a.begin(), a.end());
        sort(b.begin(), b.end());

        printf("%s\n", a==b ? "YES" : "NO");
}