func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string a, b;     cin >> a >> b;     string s =    ;     sort(b.rbegin(), b.rend());     if (a.size() > b.size())       s = b.substr(0, a.size());     else       s = b;     for (int i = 0; i < a.size(); i++) {       if (a[i] ==  9 )         continue;       else if ((a[i] +  0 ) < (s[0] +  0 )) {         a[i] = s[0];         s.erase(0, 1);       }     }     cout << a << endl;   }   