func_code_string: #include <bits/stdc++.h>   using namespace std;   #pragma GCC optimize( O3 )   #pragma GCC target( sse4 )   void __print(int x) { cerr << x; }   void __print(long x) { cerr << x; }   void __print(long long x) { cerr << x; }   void __print(unsigned x) { cerr << x; }   void __print(unsigned long x) { cerr << x; }   void __print(unsigned long long x) { cerr << x; }   void __print(float x) { cerr << x; }   void __print(double x) { cerr << x; }   void __print(long double x) { cerr << x; }   void __print(char x) { cerr <<      << x <<     ; }   void __print(const char *x) { cerr <<     << x <<    ; }   void __print(const string &x) { cerr <<     << x <<    ; }   void __print(bool x) { cerr << (x ?  true  :  false ); }   template <typename T, typename V>   void __print(const pair<T, V> &x) {     cerr <<  { ;     __print(x.first);     cerr <<  , ;     __print(x.second);     cerr <<  } ;   }   template <typename T>   void __print(const T &x) {     int f = 0;     cerr <<  { ;     for (auto &i : x) cerr << (f++ ?  ,  :   ), __print(i);     cerr <<  } ;   }   void _print() { cerr <<  ] n ; }   template <typename T, typename... V>   void _print(T t, V... v) {     __print(t);     if (sizeof...(v)) cerr <<  ,  ;     _print(v...);   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n;     cin >> n;     string s;     cin >> s;     string ans;     for (int i = 0; i < s.size(); ++i) {       if (s[i] ==  4 ) {         ans +=  322 ;       } else if (s[i] ==  6 )         ans +=  53 ;       else if (s[i] ==  8 )         ans +=  7222 ;       else if (s[i] ==  9 )         ans +=  3372 ;       else if (s[i] !=  1  && s[i] !=  0 )         ans += s[i];     }     sort(ans.begin(), ans.end());     reverse(ans.begin(), ans.end());     cout << ans;     return 0;   }   