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: Runtime Error)

#include<stdio.h>

    int main(){

      int i,A,B,C,D;

      scanf("%d",i);

      A = i/1000;
      B = i%1000;
      B = i/100;
      C = i%100;
      C = i/10;
      D = i%10;

      if(A==B||B==C||C==D){printf("Bad");}
      else(printf("Good"));
                   
      return 0;

      }