#include<iostream>
#include<string>
using namespace std;
int main() {
	string A, B;
	char soat;
	int byte, i = 0;
	cin >> A >> B;
	for (int i = 0; i < B.length();i++) {
		for (int j =i ; j < A.length(); j++) {
			if (B[i] == A[j]) {
				soat = A[i];
				A[i] = A[j];
				A[j] = soat;
			}
		}
		//cout << A << endl;
	}
	//cout << A << endl << B << endl;
	if (A == B) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}

	return 0;
}