func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     if (s.size() == 1) {       int a = s[0] - 48;       if (a % 4 == 0)         cout << 4;       else         cout << 0;     } else {       int a = (s[s.size() - 2] - 48) * 10 + (s[s.size() - 1] - 48);       if (a % 4 == 0)         cout << 4;       else         cout << 0;     }     return 0;   }   