#include<iostream>
#include<string>
using namespace std;

int cnt[2][200];
string s[2];

int main() {
cin >> s[0] >> s[1];
for(int i = 0; i < 2; i++ )
for(int j = 0; j < s[i].length(); j++ )
cnt[i][s[i][j]]++;

for(int i = 0; i < 200; i++ ) {
if ( cnt[0][i] != cnt[1][i] ) {
cout << "NO" << endl;
return 0;
}
}
cout << "YES" << endl;
return 0;
}