import sys
input = sys.stdin.readline

N, K = map(int, input().split())
S = input()[:-1]
ans = []

for i in range(K-1, N):
    ans.append(S[i])

if (N-K+1)%2==0:
    ans += list(S[:K-1])
else:
    ans += list(reversed(S[:K-1]))

print(''.join(ans))