import algorithm, math, sequtils, strutils, macros

let read* = iterator: string =
  while true: (for s in stdin.readLine.split: yield s)

template input*(T: static[typedesc]): untyped = 
  when T is int: read().parseInt
  elif T is float: read().parseFloat
  elif T is string: read()

let N, K = input(int)
let S = "#" & input(string)
echo S[K .. N] & S[1 .. K - 1]