package main

import (
  "fmt"
)

func main() {
  var (
    n,k int
    str string
  )
  fmt.Scan(&n)
  fmt.Scan(&k)
  fmt.Scan(&str)
  if n==k {
    fmt.Println(reverse(str))
  } else {
    fmt.Println(str[k-1:]+str[:k-1])
  }
}

func reverse(s string) string {
    rs := []rune(s)
    for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
        rs[i], rs[j] = rs[j], rs[i]
    }
    return string(rs)
}