oparin-alexander

file_name = input()
fin = open(file_name, 'r')
text = fin.readlines()
dictionary = {}
for str in text:
	for word in str.split():
		try:
			dictionary[word] = dictionary[word] +1
		except KeyError:
			dictionary[word] = 1

oparin-alexander

s = input()
print (len( set( s.split())))