Certainly! Here's a Python script that takes a list or set as an input, and returns a set if it is a list, and a list if it is a set, using a function named "invert_sl":
``` 
def invert_sl(input):
    if type(input) == list:
        return set(input)
    elif type(input) == set:
        return list(input)
    else:
        return "Error: Input must be a list or set"

# Example usage:
my_list = [1, 2, 3, 4, 4, 5]
my_set = {1, 2, 3, 4, 5}

# calling function for list and printing returned value
inverted_list = invert_sl(my_list)
print(inverted_list)

# calling function for set and printing returned value
inverted_set = invert_sl(my_set)
print(inverted_set)
``` 
When you call the function with a list as input, it returns a set with the same values. When you call the function with a set as input, it returns a list with the same values. If you pass any other type of input, the function will return an error message.
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