Using the `subjects` dictionary, write a for loop that loops across the dictionary and collects all subject numbers (ex. 'S2') where the dictionary value is True. Imagine, for example, the dictionary indicates whether processing is complete, and we wanted to get a list of the subjects where processing is complete. To answer this question, use a for loop across the `subjects` dictionary. You then need to get the associated value in each iteration and check if it is `True`. If it is `False`, you can use `continue` to skip ahead to the next iteration. Otherwise, append the subject number (ex 'S2') to a list called `finished`.

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