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>

int Check(int S){
  int i, s0, s;
  s0 = S % 10;
  for(i = 1;i < 4;i++){
    S *= 0.1;
    s = S % 10;
    if(s == s0) return 1;
    s0 = s;
  }
  return 0;
}

int main(void){
  int S;
  scanf("%d", &S);
  if(Check(S) == 1) printf("Bad\n");
  else printf("Good\n");
  return 0;
}