func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     string s;     cin >> s;     int count = 0;     while (s.size() != 1) {       int sum = 0;       for (int i = 0; i < s.size(); i++) sum += s[i] - 48;       string res =   ;       while (sum) {         int digit = sum % 10;         sum /= 10;         res += (char)(digit + 48);       }       s = res;       count++;     }     cout << count;   }   