43. 집합의 합·교·차·대칭차 연산

1a = {2, 4, 6, 8, 10}
2b = set([3, 6, 9, 6, 3, 12])
3print(len(b))
4print(sorted(a | b))
5print(sorted(a & b), sorted(a - b))
6print(sorted(a ^ b))
7a.add(9)
8a.add(4)
9b.discard(5)
10count = 0
11for x in sorted(a):
12    if x in b:
13        count += x
14print(len(a), len(b), count)
15print(len(set("banana")), {6, 12} <= b)