fun main(args: Array<String>) = p1020()

fun p1020() {
    val (n, k) = readLine()!!.split(' ').map { it.toInt() }
    val s = readLine()!!

    if (n == k) return println(s.reversed())

    val answer = s.drop(k - 1) + s.take(k - 1)

    println(answer)
}