Question: Write a function def letters (s) that gets the letters of string as a set. Ex: If the string is: Happy Birthday to you! the

Write a function def letters (s) that gets the letters of

Write a function def letters (s) that gets the letters of string as a set. Ex: If the string is: Happy Birthday to you! the set returned is: {i,h,p,a,B,t,H,d,y,u,r,0} Note that both upper- and lowercase letters appear in the set. Write the function only. Unit testing will be used to test the return value

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