module Main where
import qualified Control.Monad as C
import qualified Data.Char as C
import qualified Data.List as L
import qualified Data.Map as M
import qualified Data.Array as A

int = read :: String -> Int
getWord :: IO String
getWord = do
  c <- getChar
  if C.isSpace c
  then
    return []
  else do
    ws <- getWord
    return (c:ws)
getInt = fmap int getWord
replace pred a = map (\x -> if pred x then a else x)

main = interact $ printer . solver . parser
parser = words
printer = unlines . (:[])

solver [ns,ks,ss] = a ++ (map C.toLower c) ++ d
  where
    k = (int ks) - 1
    (a,b) = splitAt k ss
    (c,d) = splitAt 1 b