#include<bits/stdc++.h>

using namespace std;

void combi(){

}

int main(){
    string A, B; cin >> A >> B;

    int A_n[200] = {}, B_n[200] = {};

    for(int i = 0; i < A.size(); ++i){
	A_n[A[i]]++;
	B_n[B[i]]++;
    }

    bool isEqual = true;
    for(int i = 0; i < 200; ++i){
	if(A_n[i] != B_n[i]) isEqual = false;
    }
    if(isEqual) cout << "YES" << endl;
    else cout << "NO" << endl;
}