#!/usr/bin/env python3
import sys
MOD = 998244353

def main():
    N, K = map(int, input().split())
    S = input()
    for i in range(N - K + 1):
        S = S[:i] + S[i:i + K][::-1] + S[i + K:]
    print(S)
    return

if __name__ == '__main__':
    main()