#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);i++)
#define ALL(A) A.begin(), A.end()

using namespace std;

typedef long long ll;
typedef pair<int, int> P;

int na[26], nb[26];

int main()
{
	memset(na, 0, sizeof(na));
	memset(nb, 0, sizeof(nb));
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	string A; cin >> A;
	string B; cin >> B;

	int n = A.length();
	rep (i, n){
		++na[(int)(A[i] - 'a')];
		++nb[(int)(B[i] - 'a')];
	} // end rep

	bool ok = true;
	rep (i, 26){
		if (na[i] != nb[i]){
			ok = false;
			break;
		} // end if
	} // end rep

	cout << (ok ? "YES" : "NO") << endl;

	return 0;
}