def omit_hashtag(message, hashtag):
    return message.replace(hashtag, "", 1)

'''
The local transport authority is organizing an online picture contest.
Participants must take pictures of transport means in an original way,
and then post the picture on Instagram using a specific hashtag.

The local transport authority needs your help. They want you to take out
the hashtag from the posted message. Your task is to implement the function

def omit_hashtag(message, hashtag):

Examples

* ("Sunny day! #lta #vvv", "#lta") -> "Sunny day!  #vvv" (notice the double space)
* ("#lta #picture_contest", "#lta") -> " #picture_contest"

Notes

    When multiple occurences of the hashtag are found, delete only the first one.

    In C, you should modify the message, as the function returns a void type.
    In Python, you should return the answer.

    There can be erroneous messages where the hashtag isn't present.
    The message should in this case stay untouched.

    The hashtag only consists of alphanumeric characters.

'''
