func_code_string: #include <bits/stdc++.h>   using namespace std;   bool cmp(long long x, long long y) { return x > y; }   int main() {     long long n;     cin >> n;     string S;     cin >> S;     vector<long long> C;     for (long long i = 0; i < n; i++) {       long long x = S[i] -  0 ;       if (x == 0 || x == 1)         continue;       else if (x == 2)         C.push_back(2);       else if (x == 3)         C.push_back(3);       else if (x == 4)         C.push_back(2), C.push_back(2), C.push_back(3);       else if (x == 5)         C.push_back(5);       else if (x == 6)         C.push_back(5), C.push_back(3);       else if (x == 7)         C.push_back(7);       else if (x == 8)         C.push_back(7), C.push_back(2), C.push_back(2), C.push_back(2);       else if (x == 9)         C.push_back(7), C.push_back(3), C.push_back(3), C.push_back(2);     }     sort(C.begin(), C.end(), cmp);     for (auto it : C) cout << it;   }   