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

def ll_insert(head, name, phone):
    current = head
    while current is not None:
        if current['name'] == name:
            current['phone'] = phone
            return head
        current = current['next']
    
    new_node = create_node(name, phone)
    
    if head is None:
        return new_node
    
    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
    
    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 pair: pair[0])
    return records

if __name__ == '__main__':
    head = None
    head = ll_insert(head, 'Иван', '123-456')
    head = ll_insert(head, 'Борис', '789-012')
    head = ll_insert(head, 'Анна', '345-678')
    head = ll_insert(head, 'Иван', '111-222')
    print(ll_list_all(head))
    print(ll_find(head, 'Иван'))
    print(ll_find(head, 'Петр'))
    head = ll_delete(head, 'Борис')
    print(ll_list_all(head))