import std.stdio;
import std.algorithm;
import std.math;
import std.conv;
import std.string;

T readNum(T)(){
  return readStr.to!T;
}

T[] readNums(T)(){
  return readStr.split.to!(T[]);
}

string readStr(){
  return readln.chomp;
}

void main(){
  auto s = readStr;
  bool dif;

  foreach(i; 0 .. 3){
    if(s[i] == s[i+1]) dif = true;
  }

  writeln(dif ? "Bad" : "Good");
}
