#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main(void) {
	char c;
	vector<char> A, B;
	while((c = getchar()) != '\n'){
		A.push_back(c);
	}
	while((c = getchar()) != '\n'){
		B.push_back(c);
	}
	sort(A.begin(), A.end());
	sort(B.begin(), B.end());
	if(A == B){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
	return 0;
}