### get the original age
age = input("Enter your age (in human years): ")
print		# print a blank line

### do some range checking, then print result
if age < 0:
	print "Negative age?!?  I don't think so."
elif age < 3 or age > 110:
	print "Frankly, I don't believe you."
else:
	print "That's", age*7, "in dog years."

### pause for Return key (so window doesn't disappear)
raw_input('press Return>')