import Foundation

func readInt() -> [Int] {
    return readLine()!.split(separator: " ").map { c in Int(c)! }
}

func main() {
    let line = readInt()
    let N = line[0]
    let K = line[1]

    let S = readLine()!

    let front = S.prefix(K-1)
    var back = S.suffix(N-K+1)

    if (N - K) % 2 == 0 {
        back += front.reversed()
    } else {
        back += front
    }

    print(back)
}

main()