#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>

#define ALL(x) (x).begin(),(x).end()

using namespace std;
int main(){
    string a,b;
    cin >> a >> b;
    vector<int> A(26);
    for(int i = 0;i < a.length();i++){
        A[a[i]-'a']++;
    }
    vector<int> B(26);
    for(int i = 0;i < a.length();i++){
        B[b[i]-'a']++;
    }
    string ans = "YES\n";
    for(int i = 0;i < 26;i++){
        if(A[i] != B[i])ans = "NO\n";
    }
    cout << ans;
    return 0;
}