import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N, K = map(int, readline().split())
S = read().rstrip().decode()

L = S[: K - 1]
R = S[K - 1:]

if (N - K) & 1:
    L = L[::-1]
S = R + L

print(R + L)