s1 = {'a', 'b', 'c', 'd'}
s2 = {'x', 'z', 'a', 'a', 'e', 'v'}

print("s1",s1)
print("s2",s2)

s3 = s1 | s2

s = s2 - s1

intersect = s1.intersection(s2)

print("Union:",s3)
print("Difference:", s)
print("Intersection:", intersect)