#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
using namespace std;


int main(){
	string a,b;
	cin>>a>>b;
	int x[30]={},y[30]={};
	
	for(int i=0;i<a.size();i++){
		x[a[i]-'a']++;
		y[b[i]-'a']++;

	}
	for(int i=0;i<28;i++){
		if(x[i]!=y[i]){
			
			 cout<<"NO"<<endl;
			 return 0;
		}
	}


	
	cout<<"YES"<<endl;
	


	return 0;
}