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 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>
void main()
{ 
  int n,r,i,sum,s=0;
  scanf("%d",&n);
  for(i=0;i<4;i++)
    { 
      r=n%10;
      n=n/10;
      sum=n%10; 
      if(sum==r)
        s++;
    }
 if(s>0)
   printf("bad");
  else
    printf("good");
}