Theory

Letters

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Write a program that calculates how many distinct letters the input word has. The word is stored in the variable word. Print out the result you'll get.

You must use a method for creating a set and a function that helps you compute the number of elements in it.

Sample Input 1: 

mississippi

Sample Output 1: 

4
Write a program in Python 3
word = input() # the input word
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