func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   const int NAX = 2e5 + 5, MOD = 1000000007;   struct Solution {     Solution() {}     void solveCase() {       set<string> ss;       for (size_t i = 0; i <= 100; i += 4) {         auto I = to_string(i);         ss.insert(I);         if (i < 10) {           I =  0  + I;           ss.insert(I);         }       }       string str;       cin >> str;       char prev =   0 ;       ll res = 0;       ;       for (size_t i = 0; i < str.size(); i++) {         string curr =   ;         curr += str[i];         if (ss.count(curr)) res++;         if (i > 0) {           curr = prev + curr;           if (ss.count(curr)) res += i;         };         prev = str[i];       }       cout << res <<   n ;     }   };   int32_t main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int t = 1;     Solution mySolver;     for (int i = 1; i <= t; ++i) {       mySolver.solveCase();     }     return 0;   }   