#include <bits/stdc++.h>
using namespace std;
int numa[1000],numb[1000];
int cnta[1000],cntb[1000];
int main(){
	string a,b;
	cin>>a>>b;
	if(a.size()!=b.size()){
		cout<<"NO\n";
		return 0;
	}
	for(int i = 0 ; i < a.size() ; i++){
		/*
		if(s[i] == 'A') s3[i] = s3[i] + 'Z';
		else s3[i] = s3[i] + (s[i] + 1);
		a[s2[i]]++;
		b[s3[i]]++;
		an=1;
		*/
		numa[a[i]]++;
		numb[b[i]]++;
	}
	for(int i = 65; i <=90; i++){
		cnta[numa[i]]++;
		cntb[numb[i]]++;
	}
	for(int i=1;i<=100;i++){
		if(cnta[i]!=cntb[i]){
			cout<<"NO\n";
			return 0;
		}
	}
	cout<<"YES\n";
	return 0;
}

bydongliyang

teacher: huhe

from:huhe&&dongliyang

/*************************
from huhe&&dongliyang
*************************/
#include<iostream>
#include<ostream>
using namespace std;
string a,b;
int suma[3000000],sumb[3000000],cnta[3000000],cntb[3000000];
int main(){
	cin>>a>>b;
	if(a.size()!=b.size()){
		cout<<"NO";
		return 0;
	}
	for(int i=0;i<a.size();i++){
		suma[a[i]]++;
		sumb[b[i]]++;
	}
	for(int i=65;i<=90;i++){
		cnta[suma[i]]++;
		cntb[sumb[i]]++;
	}
	for(int i=1;i<=100;i++){
		if(cnta[i]!=cntb[i]){
			cout<<"NO";
			return 0;
		}
	}
	cout<<"YES";
}