# include <iostream>
# include <algorithm>
# include <vector>
# include <string>
# include <set>
# include <map>
# include <cmath>
# include <iomanip>
# include <functional>
# include <utility>
# include <stack>
# include <queue>
# include <list>
# include <bitset>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
constexpr long long MOD = 1000000000 + 7;
constexpr long long INF = 1000000000;
const double PI = acos(-1);

int ca[100], cb[100];

int main() {
	string a, b;
	cin >> a >> b;
	for (int i = 0; i < a.size(); i++) {
		ca[a[i] - 'a']++;
		cb[b[i] - 'a']++;
	}
	for (int i = 0; i < 30; i++) {
		if (ca[i] != cb[i]) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
}