def ll_make_node(name, phone):
    return {'name': name, 'phone': phone, 'next': None}


def ll_insert(head, name, phone):
    if head is None:
        return ll_make_node(name, phone)

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

    new_node = ll_make_node(name, phone)
    new_node['next'] = head
    return new_node


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

    if head['name'] == name:
        return head['next']

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

    return head


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

def ht_make(size=256):
    return [None] * size


def ht_hash(buckets, name):
    return hash(name) % len(buckets)


def ht_insert(buckets, name, phone):
    idx = ht_hash(buckets, name)
    buckets[idx] = ll_insert(buckets[idx], name, phone)


def ht_find(buckets, name):
    idx = ht_hash(buckets, name)
    return ll_find(buckets[idx], name)


def ht_delete(buckets, name):
    idx = ht_hash(buckets, name)
    buckets[idx] = ll_delete(buckets[idx], name)


def ht_list_all(buckets):
    result = []
    for bucket_head in buckets:
        current = bucket_head
        while current is not None:
            result.append((current['name'], current['phone']))
            current = current['next']
    return sorted(result, key=lambda x: x[0])

def bst_make_node(name, phone):
    return {'name': name, 'phone': phone, 'left': None, 'right': None}


def bst_insert(root, name, phone):
    new_node = bst_make_node(name, phone)

    if root is None:
        return new_node

    current = root
    while True:
        if name == current['name']:
            current['phone'] = phone
            return root
        elif name < current['name']:
            if current['left'] is None:
                current['left'] = new_node
                return root
            current = current['left']
        else:
            if current['right'] is None:
                current['right'] = new_node
                return root
            current = current['right']


def bst_find(root, name):
    current = root
    while current is not None:
        if name == current['name']:
            return current['phone']
        elif name < current['name']:
            current = current['left']
        else:
            current = current['right']
    return None


def _bst_min_node(node):
    current = node
    while current['left'] is not None:
        current = current['left']
    return current


def bst_delete(root, name):
    if root is None:
        return None

    if name < root['name']:
        root['left'] = bst_delete(root['left'], name)
    elif name > root['name']:
        root['right'] = bst_delete(root['right'], name)
    else:
        if root['left'] is None:
            return root['right']
        elif root['right'] is None:
            return root['left']
        else:
            successor = _bst_min_node(root['right'])
            root['name'] = successor['name']
            root['phone'] = successor['phone']
            root['right'] = bst_delete(root['right'], successor['name'])

    return root


def bst_list_all(root):
    result = []
    stack = []
    current = root

    while current is not None or stack:
        while current is not None:
            stack.append(current)
            current = current['left']
        current = stack.pop()
        result.append((current['name'], current['phone']))
        current = current['right']

    return result