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>
using namespace std;

#define pb push_back
#define ll long long
#define ff first
#define ss second
#define pii pair<int,int> 
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL);

int main(){
    fastio
    string s;
    cin>>s;
    int n = s.length();
    int flg=1;
    for(int i=0;i<n-1;i++){
        if(s[i]==s[i+1]){
            flg =0;
            break;
        }
    }
    if(flg) cout<<"Good";
    else    cout<<"Bad";
}