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 PHP (5.6.30) (judge verdict: Runtime Error)

<?php

fscant(STDIN, "%s", $IntCode);
$StrCode = (string) $IntCode;
$ArrayCode = array(0,0,0,0);
$Result == "Good";

for($i = 0; $i < 4; $i++)
{
	$ArrayCode[$i] = substr($StrCode, i, 1);
}

for ($i = 0; $i < 3; $i++) { 
	if($ArrayCode[$i] == $ArrayCode[$i + 1])
	{
		$Result = "Bad";
	}
}


echo $Result;