#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <utility>

using namespace std;

int main(void){

    string a, b;
    cin >> a >> b;
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    for(int i = 0; i < a.size(); i++){
        if(a[i] != b[i]){
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;

    return 0;
}