How to parse this result

Question

I want to get the id and first_name of a user using the GetContactsRequest method from the Telethon library so that I can send a message using that id without having to hard code the id of every contact I have. This is the code

from telethon.sync import TelegramClient
from telethon import functions, types

with TelegramClient('session', api_id, api_hash) as client:
    result = client(functions.contacts.GetContactsRequest(
        hash=0
    ))
    print(result.stringify())

This is the output of result.stringify()

Contacts(
    contacts=[
        Contact()
        Contact()
    ]
    users=[
        User(
            id = xxx
            first_name = 'name'
        ),
        User(
            id = xxx
            first_name = 'name'
        )
    ]
)

The problem is I am not sure how to parse this, Any help would be really appreciated