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: Wrong Answer)

    function Main(input) {
      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;
        }
      }
    }

    Main(require("fs").readFileSync("/dev/stdin", "utf8"));