func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     string s;     int n, x = 0, ans;     cin >> s;     n = s.length();     for (int i = 0; i < n; i++) {       x = x * 10 + (s[i] -  0 );       x = x % 4;     }     ans = (1 + (int)pow(2, x) + (int)pow(3, x) + (int)pow(4, x)) % 5;     cout << ans <<   n ;   }   