import sys
myset = set(map(str, sys.stdin.read().split()))
print(len(myset))

472c177d8e4b9a2e20f28cc5dc41c4118ebeffd9
<mask token>

<mask token>
print(len(myset))

<mask token>
myset = set(map(str, sys.stdin.read().split()))
print(len(myset))

import sys
myset = set(map(str, sys.stdin.read().split()))
print(len(myset))
