import std.stdio, std.math, std.algorithm, std.array, std.string, std.conv, std.container, std.range;
T Read(T)() { return readln.chomp.to!(T); }
T[] Reads(T)() { return readln.split.to!(T[]); }
alias read = Read!(int);
alias reads = Reads!(int);


void main() {
    string s = readln.chomp;
    foreach (i;0..3) if (s[i] == s[i+i]) {
        writeln("Bad");
        return;
    }
    writeln("Good");
}
