#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<int> v1(26), v2(26);
    string s1, s2;
    cin >> s1 >> s2;
    for(int i=0; i<s1.size(); ++i) {
        v1[s1[i]-'a']++;
        v2[s2[i]-'a']++;
    }
    if(v1 == v2) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
}