func_code_string: #include <bits/stdc++.h>   using namespace std;   string ans[10] = {  ,   ,  2 ,  3 ,  223 ,  5 ,  53 ,  7 ,  7222 ,  7332 };   int main() {     int n;     string s, a =   ;     cin >> n;     cin >> s;     for (int i = 0; i < n; i++) {       if (s[i] ==  0  || s[i] ==  1 ) continue;       a += ans[(s[i] -  0 )];     }     sort(a.begin(), a.end());     reverse(a.begin(), a.end());     cout << a << endl;   }   