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: Runtime Error)

function Main(input) {
	// 1行目がinput[0], 2行目がinput[1], …に入る
	// input = input.split("\n");
	// tmp = input[1].split(" ");
	//文字列から10進数に変換するときはparseIntを使います
	//var a = parseInt(input, 10);
	//出力
    var numbers = new Array(input[0], input[1], input[2], input[3]);
  	for (var i = 0; i <= numbers.length; i++) {
        if (input[i] - input[++i] == 0) {
		   console.log("Bad");
           break;
	  } else if (input[3] - input[2] || input[2] - input[1] || input[1] - input[0]) {
         console.log("good");
        break;
     } 
    }
	
}


//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
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