#include <bits/stdc++.h>
using namespace std;



int main(){
    char a[11],b[11];
    for(int i = 0; i < 11; i++){
        a[i] = 0;
        b[i] = 0;
    }
    cin >> a >> b;
    sort(a, a + sizeof(a));
    sort(b,b+sizeof(b));
    for(int i = 0; i < 11; i++){
        if(a[i] != b[i]){
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;

    return 0;


}