class Node:
    def __init__(self, data):
        self.data = data
        self.next = None


def build(arr):
    head = None
    for x in reversed(arr):
        node = Node(x)
        node.next = head
        head = node
    return head


def find_second(head):
    count = 0
    while head:
        if head.data % 6 == 0:
            count += 1
            if count == 2:
                return head
        head = head.next
    return None


while True:
    try:
        print("\n1 - создать список")
        print("2 - найти элемент")
        print("0 - выход")
        c = input(">> ")

        if c == "1":
            arr = list(map(int, input().split()))
            head = build(arr)
        elif c == "2":
            res = find_second(head)
            print(res.data if res else "nil")
        elif c == "0":
            break
    except:
        print("Ошибка")