n, k = map(int, input().split())
s = input()

if n == k:
    print("".join(reversed(s)))
    exit(0)

ans1 = s[k-1:]
ans2 = s[:k-1]
if (n - k + 1) % 2 == 1:
    ans2 = "".join(reversed(ans2))

print(ans1 + ans2)