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Not sure howto do this

I looked at the "elementary" challenge and I don't know what I am supposed to do. Am I fixing the code. I don't know anything about Python and was hoping I could learn it here but I am completely lost :(

At the bottom it sais Precondition: 0 < len(data) < 1000

What does this mean?

Created: Sept. 26, 2014, 11:42 p.m.
Updated: Sept. 26, 2014, 11:55 p.m.
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Costello