#include<bits/stdc++.h>
using namespace std;

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	string a,b; cin>>a>>b;
	sort(a.begin(),a.end()); sort(b.begin(),b.end());
	cout<<(a==b?"YES"s:"NO"s)<<"\n"s;
}