In Python 3, write a decorator function that has the following property:

1. The name of the decorator is uppercase and takes a function as input.
2. The decorator has an inner function called wrapper with no input argument.
3. The wrapper function has two local variables: original and modified.
4. The input function argument of decorator gets assigned to the original variable inside the wrapper function and the upper case version of the input function gets assigned to the modified variable.
5. The wrapper function returns the modified variable.
6. The decorator returns the wrapper (per the usual of the inner functions in decorators)
7. Write a new function called greetings that prints "Hello".
8. Decorate the greetings function with the uppercase decorator function.
9. Run the program by invoking the greetings function. Record the output and include it with your code.
10. Save the decorator uppercase as a separate Python file and import it to a new file that defines the greetings function as a decorated function that simply prints the "Hello" message.
11. Generate the output by invoking the greetings function.