Is there any way to preserve the actual function even after wrapping up with a decorator in python

Question

@dec_sub
    def sub(a, b):
        c= a-b
        return c
    
    def dec_sub(func):
        def wrapper(a, b):
            if a<b:
                a, b = b, a
            return func(a, b)
        return wrapper
    
    print(sub(48, 9)) # first digit is bigger than the second one yields positive return
    print(sub(1, 8)) # second digit is bigger than the first one also yields positive return

#Output : 39
          7

In the above code, how to use the function 'sub' in a usual way without the influence of the decorator?