#include<iostream>
#include<cmath>
#include<string>
#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";
}