<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def main(uid, password, photo, users_service, auth_service, photos_service):
 """Authenticate user and upload photo."""

    user = users_service.get_user_by_id(uid)
    auth_service.authenticate(user, password)
    photos_service.upload_photo(user['uid'], photo)