#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;


int main(void) {
	string s, t;
	int dps[26] = {};
	int dpt[26] = {};

	cin >> s >> t;
	FOR(i, 0, s.size() - 1) {
		FOR(u, 0, 25) {
			if (s[i] == 'a' + u) {
				dps[u]++;
			}
			if (t[i] == 'a' + u) {
				dpt[u]++;
			}
		}
	}
	FOR(i, 0, 25) {
		if (dps[i] != dpt[i]) {
			cout << "NO" << endl;
			break;
		}
		if (i == 25) {
			cout << "YES" << endl;
			break;
		}
	}
	return 0;
}