main :: IO ()
main = do
  ha <- readLn :: IO Int
  hb <- readLn :: IO Int
  hc <- readLn :: IO Int
  if ha > hb
    then if hb > hc
      then putStrLn "A\nB\nC"
      else if ha < hc
        then putStrLn "C\nA\nB"
        else putStrLn "A\nC\nB"
    else if ha > hc
      then putStrLn "B\nA\nC"
      else if hb > hc
        then putStrLn "B\nC\nA"
        else putStrLn "C\nB\nA"