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 C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>

int main()
{
    char s[5];
    scanf("%s",s);

    for (int i = 0; i < 4; ++i) {
        for (int j = i + 1; j < 4; ++j) {
            if (s[i] > s[j]) {
                char tmp =  s[i];
                s[i] = s[j];
                s[j] = tmp;
            }
        }
    }

    if ((s[0] == s[1]) && (s[2] == s[3]) && (s[0] != s[2]))
    {
        printf("Good");
    }
    else
    {
        printf("Bad");
    }
    
}