#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main()
{
    string a, b;
    cin >> a >> b;

    int ac[26] = {}, bc[26] = {};
    for(int i=0; i<a.length(); i++){
        ac[a[i] - 'a']++;
        bc[b[i] - 'a']++;
    }

    for(int i=0; i<26; i++){
        if(ac[i] != bc[i]) {
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;

    return 0;
}