func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long n, i, j, a[1000005], b[1000005], p = 0, q = 0, m, temp = 0,                                                flag = 0, ans, r = 0, s = 0;     vector<long long> v;     string str;     cin >> n;     map<long long, long long> mp;     while (1) {       if (mp[n] == 1) {         break;       }       mp[n] = 1;       p++;       n++;       while (n % 10 == 0) {         n = n / 10;       }     }     cout << p;     return 0;   }   