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 a[4];int j; int i;  int S;int x = 0;
  printf("");
  scanf("%d", &S);
  for(i = 0; i < 4; i++){
    a[i] = S % 10;
    S /= 10;
  }
  for(j = 0; j < 4; j++){
  for(i = j + 1;i < 4 ; i++){
    if(a[i] == a[j]){printf("Bad\n");x += 1;break;}
  }
  }
  if (x == 0){printf("Good\n");}
    return 0;
  }