import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	}
	static class Task{
		int M = (int) (1e9 + 3);
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve
		

			
	}//task

	static class InputReader{
		public BufferedReader reader;
		public StringTokenizer tokenizer;
		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.OutputStream; OutputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {

	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	}
	static class Task{
		int M = (int) (1e9 + 3);
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve
		

			
	}//task

	static class InputReader{
		public BufferedReader reader;
		public StringTokenizer tokenizer;
		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		
	}
} Main public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	} main {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	} InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) Task solver = new Task(); solver new Task() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class Task{
		int M = (int) (1e9 + 3);
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve
		

			
	}//task Task int M = (int) (1e9 + 3); M (int) (1e9 + 3) 1e9 3 public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve solve {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		} char[] s = in.next().toCharArray(); s in.next().toCharArray() in.next().toCharArray in.next() in.next in for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				} int i = -1; int i = -1; i -1 1 ++i < 3 ++i i 3 if(s[i] == s[i+1]) {
					out.print("Bad");return;
				} if(s[i] == s[i+1]) {
					out.print("Bad");return;
				} s[i] == s[i+1] s[i] s i s[i+1] s i+1 i 1 {
					out.print("Bad");return;
				} out.print("Bad") out.print out "Bad" return; out.print("Good") out.print out "Good" int testNumber testNumber InputReader in in PrintWriter out out static class InputReader{
		public BufferedReader reader;
		public StringTokenizer tokenizer;
		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		
	} InputReader public BufferedReader reader; reader public StringTokenizer tokenizer; tokenizer public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		} InputReader {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		} reader = new BufferedReader(new InputStreamReader(stream), 32768) reader new BufferedReader(new InputStreamReader(stream), 32768) tokenizer = null tokenizer null InputStream stream stream public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		} next {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		} while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			} tokenizer == null || ! tokenizer.hasMoreTokens() tokenizer == null tokenizer null ! tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			} try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				} catch (IOException e) {
					throw new RuntimeException(e);
				} IOException e {
					throw new RuntimeException(e);
				} throw new RuntimeException(e); new RuntimeException(e) {
					tokenizer = new StringTokenizer(reader.readLine());
				} tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public int nextInt() {
			return Integer.parseInt(next());
		} nextInt {
			return Integer.parseInt(next());
		} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		} nextIntArray {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		} int[] arr = new int[n]; arr new int[n] n for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next()); int i = -1; int i = -1; i -1 1 ++i < n ++i i n arr[i] = Integer.parseInt(next()); arr[i] = Integer.parseInt(next()) arr[i] arr i Integer.parseInt(next()) Integer.parseInt Integer next() next return arr; arr int n n public long nextLong() {
			return Long.parseLong(next());
		} nextLong {
			return Long.parseLong(next());
		} return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next public class Main {

	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	}
	static class Task{
		int M = (int) (1e9 + 3);
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve
		

			
	}//task

	static class InputReader{
		public BufferedReader reader;
		public StringTokenizer tokenizer;
		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		
	}
} public class Main {

	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	}
	static class Task{
		int M = (int) (1e9 + 3);
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve
		

			
	}//task

	static class InputReader{
		public BufferedReader reader;
		public StringTokenizer tokenizer;
		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();

	}
	static class Task{
		int M = (int) (1e9 + 3);
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			
				char[] s = in.next().toCharArray();
				for(int i = -1; ++i < 3;) if(s[i] == s[i+1]) {
					out.print("Bad");return;
				}
			
				out.print("Good");
	
		}//Solve
		

			
	}//task

	static class InputReader{
		public BufferedReader reader;
		public StringTokenizer tokenizer;
		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}
		public String next() {
			while(tokenizer == null || ! tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public int[] nextIntArray(int n) {
			int[] arr = new int[n];
			for(int i = -1; ++i < n;) arr[i] = Integer.parseInt(next());
			return arr;
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
		
	}
}