#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>
#define print(x) cout << x << endl;
using namespace std;
int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    string A,B;
    cin >> A >> B;
    sort(A.begin(), A.end());
    sort(B.begin(), B.end());
    
    if(A==B){
        print("YES");
    }else{
        print("NO");
    }
    return 0;
}