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: Accepted)

#include <stdio.h>
#include <sysexits.h>
#include <math.h>
int main(void){
  int b,i,S;
  int a[4];
  if(scanf("%d",&S)!=1){
exit(1);
}
  b=0;
  for(i=0;i<4;i++){
    a[i]=S%10;
    S=S/10;
  }
  for(i=0;i<3;i++){
    if(a[i]==a[i+1]){
      b=1;
      break;
    }
  }
  if(b==1){
  printf("Bad");
  }
  else{
    printf("Good");
  }
  return 0;
}