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>
#include <string.h>
int main()
{
    char s[100];
    int i,h,len,j,n,k,c;
    c=0;
    scanf(" %[^\n]", s);
    len=strlen(s);
    for(i=0;i<len;i++){

        if((s[i]==s[i+1])||(s[i]==s[i+2])||(s[i]==s[i+3])||(s[i+2]==s[i+1])||(s[i+2]==s[i+3])||(s[i+3]==s[i+1])) {
            c++;
        }}
         if(c==2||c==4) { printf("Good\n");
        }
        else{
            printf("Bad\n");
        }


    return 0;
}