Question: Write a procedure called unique_letters(str) that takes as its input a string of any length. The procedure should use a python set to reduce the

Write a procedure called unique_letters(str) that takes as its input a string of any length. The procedure should use a python set to reduce the string to a list of unique letters in the string and should then print out how many unique letters was found.

Do not call the procedure.

For example:

Test	Result
unique_letters("aaaaabbbbabbabbababccccccaaccca")	3
unique_letters("Johan")	5

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