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

int main(){
    string s1, s2;
    cin >> s1 >> s2;
    sort(s1.begin(), s1.end());
    sort(s2.begin(), s2.end());
    if(s1 == s2){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
    return 0;
}