#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
	string a, b;
	cin >> a >> b;
	int n = a.size();
	map<char, int> mp, mq;
	rep(i, n) mp[a[i]]++;
	rep(i, n) mq[b[i]]++;
	for (auto p : mp) {
		if (p.second != mq[p.first]) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}