#include <iostream>
#include <sstream>
#include <math.h>
#include <stack>
#include <set>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <map>
#include <cstdio>
#include <vector>
using namespace std;

#define INF (1 << 30)
#define INFLL (1LL << 60)

int main() {
	string a,b;
	int cou_a[30] = {},cou_b[30] = {};
	cin >> a >> b;
	for(int i = 0;i < a.size();i++){
		cou_a[a[i]-97]++;
		cou_b[b[i]-97]++;
	}
	bool flag = 1;
	for(int i = 0;i < 30;i++){
		if(cou_b[i] != cou_a[i]) flag = 0;
	}
	if(flag) cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}