#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;
}