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 Kotlin (1.0.0) (judge verdict: Accepted)

fun main(Args: Array<String>) {
    val List = readLine()!!
    val S1 = List[0]
    val S2 = List[1]
    val S3 = List[2]
    val S4 = List[3]
    if(S1 == S2 || S2 == S3 || S3 == S4) {
        println("Bad")
    } else {
        println("Good")
    }
}