import Foundation
let n = readLine()!.split(separator: " ").map{Int($0)!}
var S = String(readLine()!)
let (N,K) = (n[0],n[1])
let s = S.index(S.startIndex, offsetBy: K-1)
var T = String(S[..<s])
let U = S[s...]
if (N - K) % 2 == 0{
    T = String(T.reversed())
}
print(U + T)