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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
#define pans cout<<ans<<endl;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;

int main(){
  	string s;cin>>s;
    bool flag=false;
  	for(int i=0;i<3;i++){
      if(s[i]==s[i+1]){
        flag=true;
      }
    }
  int a=0;
  	for(int i=0;i<1000000;i++){
      a+=1;
    }
  	if(flag){
      cout<<"Bad"<<endl;
    }else{
      cout<<"Good"<<endl;
    }
  
	return 0;
}