#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

bool isAlphaString(const string& s) {
    for (char c : s) {
        if (!isalpha(c)) return false;
    }
    return true;
}

int main() {
    string str1, str2;
    cin >> str1 >> str2;

    if (str1.length() > 10 || str2.length() > 10 || !isAlphaString(str1) || !isAlphaString(str2)) {
        cout << "Invalid input\n";
        return 0;
    }

    string s1 = str1, s2 = str2;
    sort(s1.begin(), s1.end());
    sort(s2.begin(), s2.end());

    if (s1 == s2) {
        cout << "YES\n";
    } else {
        cout << "NO\n";
    }

    return 0;
}