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The problem at hand involves two sets of subscribers: English and French. The task is to find the number of unique subscribers between these two sets. This is a common problem in set theory and can be solved using Python's built-in set operations.
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The solution uses Python's built-in set operation called 'symmetric_difference'. This operation returns a set that contains all items from both sets, but not the intersection (common items). In other words, it returns the unique items in each set. The 'len' function is then used to count the number of these unique subscribers. An alternative solution uses the '^' operator, which performs the same operation as 'symmetric_difference'.
number_of_english_subscribers = input()
english_subscribers = set(map(int, input().split()))
number_of_french_subscribers = input()
french_subscribers = set(map(int, input().split()))
print(len(english_subscribers.symmetric_difference(french_subscribers)))
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