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 (Clang 3.8.0) (judge verdict: Wrong Answer)

#include<stdio.h>
int main(void){
  int  s[5];
  int i;
  scanf("%d",s);
  s[1] = (int)s[0]/1000;
  s[2] = (int)s[0]/100-s[1]*10;
  s[3] = (int)s[0]/10-s[2]*10-s[1]*100;
  s[4] = (int)s[0]-s[3]*10-s[2]*100-s[1]*1000;
  for( i=0; i<4;i++){
    if(s[i] == s[i+1]){break;
    }
  }
  if(i==4)printf("good");
  else printf("Bad");
  return 0;
}