N, K = map(int, input().split())
S = list(input())

for i in range(N - K + 1):
    for x in range(i, i + K // 2):
        b = S[x] 
        S[x] = S[K + 2 * i - x - 1]
        S[K + 2 * i - x - 1] = b
print(''.join(S))