def find_kth(numbers, L, R, k):
    median = numbers[random.randrange(L, R)]
    m = L
    for i in range(L, R):
        if numbers[i] < median:
            numbers[i], numbers[m] = numbers[m], numbers[i]
            m += 1
    if k < m:
        return find_kth(numbers, L, m, k)
    elif k > m:
        return find_kth(numbers, m, R, k)
    else:
        return numbers[k]