#include <bits/stdc++.h>
using namespace std;
#define repl(i, l, r) for (ll i = (l); i < (r); i++)
#define rep(i, n) repl(i, 0, n)
#define CST(x) cout << fixed << setprecision(x)
using ll = long long;
const ll MOD = 1000000007;
const int inf = 1e9 + 10;
const ll INF = 4e18 + 10;
const int dx[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
const int dy[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
int main() {
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(false);

	string a, b;
	cin >> a >> b;
	vector<int> cnt1(26), cnt2(26);
	for (auto c : a) cnt1[c - 'a']++;
	for (auto c : b) cnt2[c - 'a']++;
	rep(i, 26) {
		if (cnt1[i] != cnt2[i]) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;

	return 0;
}