Problem:
Score : 100 points

Problem Statement

The door of Snuke's laboratory is locked with a security code.

The security code is a 4-digit number. We say the security code is hard to enter when it contains two consecutive digits that are the same.

You are given the current security code S. If S is hard to enter, print Bad; otherwise, print Good.

Constraints

S is a 4-character string consisting of digits.

Input

Input is given from Standard Input in the following format:

S

Output

If S is hard to enter, print Bad; otherwise, print Good.

Sample Input 1

3776

Sample Output 1

Bad

The second and third digits are the same, so 3776 is hard to enter.

Sample Input 2

8080

Sample Output 2

Good

There are no two consecutive digits that are the same, so 8080 is not hard to enter.

Sample Input 3

1333

Sample Output 3

Bad

Sample Input 4

0024

Sample Output 4

Bad

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>

int main(void){
  int s;
  scanf("%d",&s);
  int mod = 1000;
  int renflag = 0; //0 = false, 1 = true
  int typecount = 0;
  int nowtype;
  int s_search;
  for(int i=0; i<4; i++){
    s_search = s % mod;
    if(nowtype != s_search){
      nowtype = s_search;
      typecount++;
    }else{
      if(renflag == 1){
        renflag = 0;
      }else{
        renflag = 1;
      }
    }
    mod = mod / 10;
  }
  if(typecount == 2 && renflag == 1){
    printf("Good");
  }else{
    printf("Bad");
  }
  
}