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

void count(const string&s,vector<int>&cnt){
	for(auto&&i:s)++cnt.at(i-'a');
}

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	string a,b; cin>>a>>b;
	vector<int>aa(26,0),bb(26,0);
	count(a,aa); count(b,bb);
	cout<<(aa==bb?"YES"s:"NO"s)<<"\n"s;
}