func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s, s1, s2;     long long a, b, c = 0;     cin >> s;     b = stoi(s);     while (b > 0) {       s1 = s;       sort(s1.begin(), s1.end());       int d = stoi(s1) % 10;       b = b - d;       c++;       s = to_string(b);     }     cout << c <<   n ;   }   