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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
class Main
{
  static public void main(String args[])
  {
    Scanner in = new Scanner(System.in);
    String s = in.nextLine();
    boolean b = false;
    for(int i=0; i<s.length()-1; i++)
    {
      if(s.charAt(i) == s.charAt(i+1))
      {
        b = true;
      }
    }
    if(!b)
    {
      System.out.println("Good");
    }
    else
    {
      System.out.println("Bad");
    }
  }
}