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

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

    for (i in 0..n - k) {
        val slice = s.slice(i until i + k).reversed()
        for (j in i until i + k) {
            s[j] = slice[j - i]
        }
    }

    val answer = s.joinToString("")

    println(answer)
}