import sequtils, strutils, algorithm, math, future, sets, tables, hashes, intsets
let read = iterator : string {.closure.} = (while true: (for s in stdin.readLine.split : yield s))

var
    n,k = read().parseint
    s = read()
    tail = ""

if (n - k + 1) mod 2 == 1:
    tail = s[0 ..< k - 1].reversed.join
else:
    tail = s[0 ..< k - 1]



echo s[k - 1 ..< n] & tail