import Control.Monad (replicateM)
import Data.List (nub)

solve1 :: String -> String -> [Bool] -> String
solve1 s s' (x : []) = s' ++ s
solve1 s s' (x : xs)
    | x == True  = solve1 (tail s) (s' ++ [head s]) xs
    | x == False = solve1 (init s) (s' ++ [last s]) xs

solve2 :: Integral a => String -> a
solve2 s = fromIntegral . length . nub . map (solve1 s "")
    $ replicateM (length s) [True, False]

main = print . solve2 =<< getLine