def show_magicians(names):
	for name in names:
		print('Hello ' + name.title() + '!')

def make_gread(name_magicians):
	while name_magicians:
		gread_name = name_magicians.pop()
		name_1 = 'Great ' + gread_name.title()
		new_magicians.append(name_1)
	while new_magicians:
		name_gread = new_magicians.pop()
		magicians.append(name_gread)

magicians = ['petya', 'vasya', 'oleg']
new_magicians = []
make_gread(magicians)
show_magicians(magicians)