# coding: utf-8
from collections import deque
N, K = map(int, input().split())
S = list(input())
# T = deque(S)
if N-K == 0:
    ans = S[::-1]
elif (N-K) % 2 == 0:
    ans = S[K-2:] + S[:K-2]
else:
    ans = S[K-1:] + S[:K-1]
print("".join(ans))