func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int A[26] = {0}, count = 0;     string s;     getline(cin, s);     for (int i = 1; i < s.size(); i += 3) {       A[int(s[i]) - 97] = 1;     }     for (int i = 0; i < 26; i++) {       if (A[i] == 1) {         count++;       }     }     cout << count;     return 0;   }   