#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	string S, T;
	cin >> S >> T;
	char A[11], B[11];
	int L = S.size();
	rep(i, L) {
		A[i] = S[i];
		B[i] = T[i];
	}
	sort(A, A + L);
	sort(B, B + L);
	int icchi = 1;
	rep(i, L) {
		if (A[i] != B[i]) icchi = 0;
	}

	if (icchi) co("YES");
	else co("NO");

	Would you please return 0;
}