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numbers = {1,2,5,7}

#adding an element to the set
numbers.add(9)
print(numbers)

#removing an element from the set
numbers.remove(5)
print(numbers)

numbers_1 = {1,2,3,4}
numbers_2 = {3,4,5,6}

#Union
print(numbers_1.union(numbers_2))

#intersection
print(numbers_1.intersection(numbers_2))

#difference
print(numbers_1.difference(numbers_2))
print(numbers_2.difference(numbers_1))

#symmetric difference
print(numbers_2.symmetric_difference(numbers_1))