import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        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 Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) A solver = new A(); solver new A() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        }

    } A public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        } solve {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        } String S = in.next(); S in.next() in.next in char[] cs = S.toCharArray(); cs S.toCharArray() S.toCharArray S for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            } int i = 1; int i = 1; i 1 i < 4 i 4 i++ i++ i {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            } {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            } if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                } cs[i - 1] == cs[i] cs[i - 1] cs i - 1 i 1 cs[i] cs i {
                    out.println("Bad");
                    return;
                } out.println("Bad") out.println out "Bad" return; out.println("Good") out.println out "Good" int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        }

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

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        A solver = new A();
        solver.solve(1, in, out);
        out.close();
    }

    static class A {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            String S = in.next();
            char[] cs = S.toCharArray();

            for (int i = 1; i < 4; i++) {
                if (cs[i - 1] == cs[i]) {
                    out.println("Bad");
                    return;
                }
            }
            out.println("Good");
        }

    }
}

