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: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 5

int main(){
    int d1, d2, d3, d4 , i, flag;
    char S[5];

    scanf("%s", S);
    flag = 0;

    d4 = atoi(S) / 1000;
    d3 = atoi(S) % 1000 / 100;
    d2 = atoi(S) % 100 / 10;
    d1 = atoi(S) % 10;
    
    if(d4 == d3)flag=1;
    if(d3 == d2)flag=1;
    if(d2 == d1)flag=1;

    if(flag == 1)printf("Bad\n");
    else printf("Good\n");

    return 0;
}