{-# 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 Text.Printf
import Debug.Trace

readInt = ( readLn :: IO Int )
readInts = map ( fst . fromJust . B.readInt ) . B.words <$> B.getLine
readNInts = readInt >>= flip replicateM readInt

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

main = do
	s <- getLine
	[ i, j ] <- readInts
	putStrLn $ solve s i j

solve s' i j = runST $ do
	s <- newListArray ( 0, length s' - 1 ) s' :: ST s ( STUArray s Int Char )
	c1 <- readArray s i
	c2 <- readArray s j
	writeArray s i c2
	writeArray s j c1
	getElems s