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 Scala (2.11.7) (judge verdict: Accepted)

import scala.math.min

object Main {
    def main(args: Array[String]) {
        var input = io.Source.stdin.getLines().mkString("\n");
        var ss = input.split("\n").toList;
        val s = ss(0);
        println(if (s(0) == s(1) || s(1) == s(2) || s(2) == s(3)) "Bad" else "Good");
    }
}