N, K = list(map(int, input().split()))
S = input()

s = S
for i in range(N-K+1):
    st = i
    en = i + K - 1

    p1 = s[:st]
    p2 = s[st:en+1]
    p3 = s[en+1:]
    s = p1 + p2[::-1] + p3
    # print(s)

print(s)