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"
#include "math.h"
int main()
{
  int i,S,g2,h[3],d;
  printf("S=");
  scanf("%d",&S);
  g2=S;
  for (i = 0; i < 4; i++)
  {
    S=S/(int)pow(10,3-i);
    h[i]=S;
    S=g2%(int)pow(10,3-i);
  }
  for (i = 0; i < 5; i++)
  {
    if (h[i]==h[i+1])
    {
      d=1;
      break;
    }else{
      d=0;
    }

  }
  if (d==1) {
    puts("Bad");
  }else{
    puts("Good");
  }
  return 0;
}