#include<iostream>
#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;
}