#include<iostream>
#include<string>

using namespace std;

int main()
{
	string A, B, answer;

	cin >> A >> B;

	for (unsigned int j = 0; j < A.length(); j++){
		int countA = 0;
		int countB = 0;
		for (unsigned int i = 0; i < A.length(); i++){
			if (A[j] == A[i]){
				countA++;
			}

			if (A[j] == B[i]){
				countB++;
			}
		}
		if (countA == countB){
			answer = "YES";
		}
		else if (countA != countB){
			answer = "NO";
			break;
		}
	}
	cout << answer << endl;
}