N, K = list(map(int, input().split(" ")))
S = input()
r = False
if N % 2 == 0 and K % 2 == 0:
    r = True
elif N % 2 != 0 and K % 2 != 0:
    r = True

S_f = S[0:K-1]
S_e = S[K-1:]
if r:
    S_f = S_f[::-1]
print(S_e+S_f)