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 JavaScript (node.js v5.12) (judge verdict: Accepted)

// inputに入力データ全体が入る
function Main(input) {
	// 1行目がinput[0], 2行目がinput[1], …に入る
    input = input.split("\n");
    // 数値の配列を作る
//    const numList0 = input[0].split(' ').map(x => parseInt(x, 10));
//    const N = numList0[0];
//    const K = numList0[1];

    // 文字列取得
    const S = input[0].split(' ')[0];
    var prevChar = '';
    var flag = false;
    for (i = 0; i < S.length; i++) {
        var c = S.charAt(i);
        if (prevChar == c) {
            flag = true;
            break;
        }
        prevChar = c;
    }

    if (flag) {
        console.log('Bad');
    } else {
        console.log('Good');
    }
}
 
Main(require("fs").readFileSync("/dev/stdin", "utf8"));