import sys


if len (sys.argv) > 1:
	t = (sys.argv[1])
	print ('Summ', t, '=', (sum(map(int,str(t)))) )

else:
	while True:
		try:
			t = int(input("Please enter number like xxx: "))
		except ValueError:
			print ("Please try again")
			continue
		else:
			break
	if t >= 100:
		print ('Your input is', t)
		print ('Summ', t, '=', (sum(map(int,str(t)))) )
	else:
		print("You need to put 3 digit")