#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
using namespace std;


#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;
/* ここからが本編 */

int main(void)
{
   ull i,j,k;
   char a[11];
   char b[11];
   cin >> a >> b;
   sort(a,a+strlen(a));
   sort(b,b+strlen(b));
   if(strcmp(a,b)) cout << "NO" << endl;
   else cout << "YES" << endl;
   return 0;
}