Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
How many letters does mississippi have, and how many different letters?
set(word) keeps each letter once.
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
The word has letters. The set of its letters is , so there are different letters.
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