#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	string S1;
	string S2;
	cin>>S1;
	cin>>S2;
	if (S1.length()!=S2.length()){
		cout<<"NO"<<endl;
		return 0;
	}
	int Flag1[26],Flag2[26];
	int i;
	for (i=0;i<26;i++){
		Flag1[i]=0;
		Flag2[i]=0;
	}
	for (i=0;i<S1.length();i++){
		Flag1[S1[i]-'a']++;
		Flag2[S2[i]-'a']++;
	}
	for (i=0;i<26;i++){
		if (Flag1[i]!=Flag2[i]){
			cout<<"NO"<<endl;
			return 0;
		}
	}
	cout<<"YES"<<endl;

	return 0;
}