def ll_insert(head, name, phone):
    current = head
    # Проверяем, существует ли уже такой абонент
    while current is not None:
        if current['name'] == name:
            current['phone'] = phone
            return head
        current = current['next']

    # Создаём новый узел
    new_node = {'name': name, 'phone': phone, 'next': None}

    # Если список пуст, новый узел становится головой
    if head is None:
        return new_node

    # Иначе проходим в конец и вставляем
    current = head
    while current['next'] is not None:
        current = current['next']
    current['next'] = new_node
    return head


def ll_find(head, name):
    current = head
    while current is not None:
        if current['name'] == name:
            return current['phone']
        current = current['next']
    return None


def ll_delete(head, name):
    if head is None:
        return None

    # Если удаляемый элемент — голова
    if head['name'] == name:
        return head['next']

    prev = head
    current = head['next']
    while current is not None:
        if current['name'] == name:
            prev['next'] = current['next']
            return head
        prev = current
        current = current['next']
    return head


def ll_list_all(head):
    records = []
    current = head
    while current is not None:
        records.append((current['name'], current['phone']))
        current = current['next']
    records.sort(key=lambda x: x[0])
    return records


# --------------------- Тестирование связного списка ---------------------
if __name__ == "__main__":
    print("=== Тестирование связного списка ===")
    head = None

    head = ll_insert(head, "Ivan", "123-456")
    head = ll_insert(head, "Boris", "789-012")
    head = ll_insert(head, "Anna", "345-678")
    head = ll_insert(head, "Ivan", "111-222")  # обновление

    print("Все записи:", ll_list_all(head))
    print("Телефон Ivan:", ll_find(head, "Ivan"))
    print("Телефон Boris:", ll_find(head, "Boris"))
    print("Телефон Noname:", ll_find(head, "Noname"))

    head = ll_delete(head, "Boris")
    print("После удаления Boris, все записи:", ll_list_all(head))