get un common strings from 2 array of strings

I have 2 lists like this

first = ['A' , 'B' , 'c' , 'd']
second = ['a' , 'b', 'e']

I want in result ['c' , 'd' ,'e'] . as It’s case insensitive and want uncommon from both lists

tried so far :

   a, b = list(set(a) - set(b)),
    list(set(b) - set(a))
 
    print("list1 : ", a)
    print("list2 : ", b)

but not working for case in sensitive

>Solution :

What you want is a difference between the union and the intersection –

(set(map(str.lower, first)) | set(map(str.lower, second))) - (set(map(str.lower, first)) & set(map(str.lower, second)))

Output

{'c', 'd', 'e'}