#문제1
# a = ['a', 'b', 'c']
# print(a)
# a = set(a)
# print(a)

#문제2
# a = [1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 5]
# aSet = set(a)
# b = list(aSet)
# print(b)

#문제3
# s1 = set(['a', 'b', 'c', 'd', 'e'])
# s2 = set(['c', 'd', 'e', 'f', 'g'])
# print(s1 - s2)

#문제4
# a = set()
# print(a)
# print(type(a))

#문제5
# a = {'a', 'b', 'c'}
# a.update({'d', 'e', 'f'})
#
# print(a)