import sys
def usage():
	print 'You should supply 2 numbers'
	print 'For example', sys.argv[0],'6 23'
if len(sys.argv) <> 3:
	usage()
else:
	try:
		a = int(sys.argv[1])
		b = int(sys.argv[2])
		print a,' added to ',b,' is ', a+b
	except ValueError:
		print 'You should type in numbers only, try again!'