N,K=map(int,input().split())
from collections import deque
S=input()
que=deque([])
for i in range(K-1,N):
    que.append(S[i])
rest_l=S[:K-1]
if (N-K)%2==0:
    rest_l=rest_l[::-1]
print("".join(que)+rest_l)