func_code_string: #include <bits/stdc++.h>   using namespace std;   void read() { freopen( input.txt ,  r , stdin); }   bool check(string s) {     long long ans = s[0] -  0 ;     ans = ans * 10ll + (s[1] -  0 );     if (ans % 4 == 0) return true;     return false;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     string s;     cin >> s;     long long ans = 0;     for (long long i = 0; i < (long long)s.size(); i++) {       if ((s[i] -  0 ) % 4 == 0) ans++;     }     string temp =   ;     for (long long i = 0; i < (long long)s.size() - 1; i++) {       temp += s.substr(i, 2);       if (check(temp)) {         ans += i + 1;       }       temp =   ;     }     cout << ans << endl;     return 0;   }   