#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <limits.h>
#include <vector>
#include <numeric>
using namespace std;

int main(){
	int count1[26] = {0};
	int count2[26] = {0};
	int flg = true;
	
	string s1,s2;
	cin >> s1 >> s2;
	for(int i=0; i<s1.length(); i++){
		count1[ s1[i] - 'a' ] ++;
		count2[ s2[i] - 'a' ] ++;
	}
	
	flg = true;
	for(int i=0; i<26; i++){
		if(count1[i] != count2[i]){
			flg = false;
		}
	}
	
	if(flg){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
	
	return 0;
}