#include <iostream>
#include <iomanip>

#include <algorithm>
#include <string>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout << fixed;//
	//cout << setprecision(7);//
	
	string A,B;
	cin >>A>>B;
	int len = A.size();
	int cA[11];
	int cB[11];
	
	for( int i=0; i<len; ++i){
		cA[i] = A[i];
		cB[i] = B[i];
	}
	sort(cA,cA+len);
	sort(cB,cB+len);

	bool ans = true;
	rep(i,len){
		if(cA[i] != cB[i]){
			ans = false;
			break;
		}
	}
	if(ans == true){
		P("YES");
	}
	else{
		P("NO");
	}
	return 0;
}