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(){

  int l,i=0;
  int s=0;

  scanf("%d",&l);

  i = 0;
  int x, g = 1000;

  while(i < 3){
    x = l/g;
    l = l%g;
    g = g/10;
    if(x == l/g){
      s = 1;
    }else{
      s = 0;
    }

    i++;
  }

  if( s == 1){
    printf("Bad\n");
  }else{
    printf("Good\n");
  }

  return 0;

}