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

c = N - K + 1
n = K - 1
p1 = S[:n]
p2 = S[n:]
# print(p1, p2)

if c % 2 == 0:
    s = p2 + p1
else:
    s = p2 + p1[::-1]

print(s)