{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE BinaryLiterals #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE NumDecimals #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}

import Control.Applicative
import Control.Arrow
import Control.Monad
import Control.Monad.ST

import Data.Char
import Data.List
import Data.Maybe

import qualified Data.ByteString.Char8 as B

import Data.Array.ST.Safe
import Data.STRef

import Debug.Trace
import Text.Printf

import Data.Map.Strict as M

readInt = readLn :: IO Int
readInteger = readLn :: IO Integer
readInts = Data.List.map ( fst . fromJust . B.readInt ) . B.words <$> B.getLine
readIntegers = Data.List.map ( fst . fromJust . B.readInteger ) . B.words <$> B.getLine

which a b f = if f then a else b
mp [ a, b ] = ( a, b )

modifyArray a i f = writeArray a i =<< f <$> readArray a i

main = do
	n <- readInt
-- 	ss <- replicateM n getLine
	ss <- Data.List.map B.unpack . B.lines <$> B.getContents
	mapM_ putStrLn $ solve ss

solve ss = runST $ do
	counts <- newSTRef ( M.empty :: M.Map String Int )
	forM_ ss $ \s -> do
		modifySTRef counts =<< 
			M.insert s . succ . fromMaybe 0 . M.lookup s <$> readSTRef counts
	ma <- snd . M.findMax <$> readSTRef counts
	sort . M.keys . M.filter ( == ma ) <$> readSTRef counts