如何正确输出字典输出不对

set1 = set([int(x) for x in input('集合A(空格分开)').split(" ")])
set2 = set([int(x) for x in input('集合B(空格分开)').split(" ")])

print("集合A",set1)
print("集合B",set2)
set3 = set1 | set2
list3 = list(set3)
list3.sort()
for l in list3:
    print(l)