import random
import time
import csv
import sys

sys.setrecursionlimit(20000)

def ll_insert(head, name, phone):
    data = {'name': name, 'phone': phone, "next": None}

    if head is None:
        return data

    current = head
    while current:
        if current['name'] == name:
            current['phone'] = phone
            return head
        if current['next'] is None:
            last = current
        current = current['next']

    last['next'] = data
    return head


def ll_find(head, name):
    current = head
    while current:
        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:
        if current['name'] == name:
            prev['next'] = current['next']
            return head
        prev = current
        current = current['next']
    return head


def ll_list_all(head):
    data_list = []
    current = head
    while current:
        data_list.append({'name': current['name'], 'phone': current['phone']})
        current = current['next']
    data_list.sort(key=lambda x: x['name'])
    return data_list