import Foundation
let n = readLine()!.split(separator: " ").map{Int($0)!}
var S = String(readLine()!)
let (N,K) = (n[0],n[1])
for i in 0..<N-K+1{
    var s = S.index(S.startIndex, offsetBy: i)
    var e = S.index(S.startIndex, offsetBy: i+K-1)
    let T = i == 0 ? "" : S[...S.index(before: s)]
    var U = S[s...e]
    var V = e == S.endIndex ? "" : S[S.index(after: e)...]
    S = T+String(U.reversed())+V
}
print(S)