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 (Clang 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>

int main( void )
{
    int cnt = 0;
    int code = 0;
    const int deca = 10;

    scanf( "%d", &code );

    for ( cnt = 0; cnt < 3; cnt++ )
    {
        if ( (code/(deca^(cnt+1))) == (code/(deca^cnt)))
        {
            printf( "bad\n" );   
        }
    }   
    if ( cnt == 3 )
    {
        printf( "good\n" );
    }
    return 0;
}