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: Wrong Answer)

<?php
# 文字列の入力
fscanf(STDIN, "%s", $s);
$tmp = str_split($s);
$bFlg = false;
for($i = 0;$i < count($tmp)-1;$i++){
    $j = $i+1;
    if($tmp[$i] == $tmp[$j]){
        $bFlg = true;
    }
}
# 出力
var_dump(($bFlg)?'Bad':'Good');
?>