#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n); ++i)

int main(){
    string a, b;
    cin >> a >> b;
    sort(a.begin(), a.end());
    
    int num = 1, al = a.size();
    rep(i,al) num *= (al - i);
    rep(i,num){
        if(a == b){
            cout << "YES\n";
            return 0;
        }
        next_permutation(a.begin(), a.end());
    }
    cout << "NO\n";
    return 0;
}