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 <string.h>
 
int main(void){
  int s;
  int a=0;
  int b=0;
  int c=0;
  int d=0;
  scanf("%d",&s);
  for (; ; ){
    if(s<1000){
      break;
    }
    a++;
    s = s-1000;
  }
  for (; ; ){
    if(s<100){
      break;
    }
    b++;
    s = s-100;
  }
  for (; ; ){
    if(s<10){
      break;
    }
    c++;
    s = s-10;
  }
  s = d;
  if(a==b||b==c||c==d){
  printf("Bad");
  }else{
  printf("Good");
  }
  return 0;
}