#include<iostream>
#include<string>

using namespace std;

#define NMAX 1000000

int main(){

	string A,B;
	int Ac[30]={0},Bc[30]={0};

	cin>>A>>B;

	for(int i=0;i<A.size();i++){
		Ac[A[i]-'a']++;
		Bc[B[i]-'a']++;
	}

	for(int i=0;i<30;i++){
		if(Ac[i]!=Bc[i]){
			cout<<"NO"<<endl;
			return 0;
		}
	}

	cout<<"YES"<<endl;


}