func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, cnt = 0;   map<int, int> mp;   int main() {     cin >> n;     mp[n]++;     cnt++;     while (n) {       n++;       while (!(n % 10)) n /= 10;       if (mp[n]) break;       mp[n]++;       cnt++;     }     cout << cnt << endl;     return 0;   }   