import java.util.*;
import static java.lang.Math.*;
import java.math.BigInteger;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	}
} import java.util.*; util.* java import static java.lang.Math.*; import static java.lang.Math.*; import static java.lang.Math.*; import java.math.BigInteger; BigInteger java.math public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	} main {
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc String result = "Good"; result "Good" for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		} int i = 1; int i = 1; i 1 i < s.length() i s.length() s.length s i++ i++ i {
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		} {
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		} if(s.charAt(i) == s.charAt(i-1)) result = "Bad"; s.charAt(i) == s.charAt(i-1) s.charAt(i) s.charAt s i s.charAt(i-1) s.charAt s i-1 i 1 result = "Bad" result "Bad" System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	}
} public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	}
} Main
import java.util.*;
import static java.lang.Math.*;
import java.math.BigInteger;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		// 入力
		String s = sc.next();
		
		// 計算
		String result = "Good";
		for(int i = 1; i < s.length(); i++){
		    if(s.charAt(i) == s.charAt(i-1)) result = "Bad";
		}

		// 出力
		System.out.println(result);
		
	}
}
