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

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

    sort(a.begin(), a.end());
    sort(b.begin(), b.end());

    if(a == b)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
        
    return 0;
}