def Format():
	try:
		while True:
			for g in range( 5 ): 	# groups of 5 blocks
				for b in range( 4 ): # blocks of 4 characters
					print( (yield), end='' ) # receive from send
				print( '  ', end='' ) # block separator
			print()					# group separator
	except GeneratorExit:			# destructor
		if g != 0 | b != 0:			# special case
			print()

fmt = Format()
next( fmt )							# prime generator
for i in range( 41 ):
	fmt.send( 'a' );				# send to yield

# Local Variables: #
# tab-width: 4 #
# compile-command: "python3.5 Format.py" #
# End: #