{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE BangPatterns #-}

import Control.Applicative
import Control.Monad
import Control.Arrow
import Data.List
import Data.Maybe
import Data.Char
import qualified Data.ByteString.Char8 as B
import Text.Printf

import Data.Ord

readInt = ( readLn :: IO Int )
readInts = map ( read :: String -> Int ) . words <$> getLine

getList = map ( fst . fromJust . B.readInt ) . B.words <$> B.getLine

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

main = do
	ps <- replicateM 3 $ mp <$> readInts
	mapM_ ( printf "%c\n" ) $ map snd $ reverse $ sortBy comp $ zip ps [ 'A' .. ]

comp ( ( h1, w1 ), _ ) ( ( h2, w2 ), _ )
	| h1 /= h2 = compare h1 h2
	| w1 /= w2 = compare w2 w1
	| otherwise = EQ