#include <iostream>
#include <cmath>
#include <climits>
#include <string>
#include <vector>
#include <functional>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
#include <utility>

#define endl '\n'
#define ALL(a)  (a).begin(),(a).end()
#define SZ(a) int((a).size())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

using namespace std;

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

int counta[26];
int countb[26];

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	string A,B;
	cin>>A;
	cin>>B;
	REP(i,SZ(A)){
		counta[A[i]-'a']++;
	}
	REP(i,SZ(B)){
		countb[B[i]-'a']++;	
	}
	string ans="YES";
	REP(i,26){
		//cout<<counta[i]<<' '<<countb[i]<<endl;
		if(counta[i]!=countb[i])	ans="NO";
	}
	cout<<ans<<endl;
	return 0;
}