import instaloader

L = instaloader.Instaloader()

USER = 'your_account'
PROFILE = USER

# Your preferred way of logging in:
L.load_session_from_file(USER)

profile = instaloader.Profile.from_username(L.context, PROFILE)

likes = set()
print('Fetching likes of all posts of profile {}.'.format(profile.username))
for post in profile.get_posts():
    print(post)
    likes = likes | set(post.get_likes())

print('Fetching followers of profile {}.'.format(profile.username))
followers = set(profile.get_followers())

ghosts = followers - likes

print('Storing ghosts into file.')
with open('/YOUR PATH/inactive-users.txt', 'w') as f:
    for ghost in ghosts:
        print(ghost.username, file=f)