def main():
    import sys
    input = sys.stdin.readline

    N, K = map(int, input().split())
    S = input().rstrip('\n')

    if (N-K+1)&1:
        print(S[K-1:] + S[:K-1][::-1])
    else:
        print(S[K-1:] + S[:K-1])


if __name__ == '__main__':
    main()