mona_captcha exercise deleted

Does anybody remember Mona_captcha.py?

Specification here:

Your program should read the number shown in an image encoded as a binary matrix. Each digit can contain a wrong pixel, but no more than one for each digit. The space between digits is equal to one pixel (just think about "1" which is narrower than other letters, but has a width of 3 pixels). Captcha Input: An image as a list of lists with 1 or 0. Output: The number as an integer.

Example:

recognize([ [0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0], [0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0], [0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0], [0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0], [0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0]]) == 394 recognize([ [0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0], [0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0], [0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0], [0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0], [0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0]]) == 394

My question: Why did you delete the exercise?