{-# LANGUAGE PartialTypeSignatures #-}
module Main (main) where

import Control.Monad
import qualified Data.ByteString.Char8 as C8
import qualified Data.Char as C
import qualified Data.List as L

main :: IO ()
main = do
  [n] <- readInts
  replicateM n readStrings >>= output . solve

solve :: [[String]] -> _
solve = length . L.nub . concat

output :: _ -> IO ()
output = print

-- utils
readInts :: IO [Int]
readInts = L.unfoldr (C8.readInt . C8.dropWhile C.isSpace) <$> C8.getLine

readStrings :: IO [String]
readStrings = map C8.unpack . C8.words <$> C8.getLine