#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>
#include <algorithm>

int main()
{
    std::string a, b;
    std::cin >> a >> b;
    std::sort(a.begin(), a.end());
    std::sort(b.begin(), b.end());
    if(a == b){
        std::cout << "YES" << std::endl;
    } else {
        std::cout << "NO" << std::endl;
    }
    return 0;
}