#include <bits/stdc++.h>
#define rep(i,a,b) for(int i = (a); i < (b); i++)
#define all(A) (A).begin(),(A).end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;

int main() {
	string s,s2; cin >> s >> s2;
	map<char,int> M,M2;
	rep(i,0,(int)s.size()){
		M[s[i]]++;
		M2[s2[i]]++;
	}
	for(auto& [k,v] : M){
		if(M2[k] != v){
			cout << "NO";
			return 0;
		}
	}
	cout << "YES";
}