Please help me to solve this issue

Question

a= set(input(":"))
t= set(input(":"))
print(a|t)

When I Entered the input and separate my set elements by using comma result come as following

:a,z
:a,y {'z', 'y', ',', 'a'} [Program finished]

It also include the comma which I used to separate my set elements .
So please help me to solve this this issue.

Answer 1

print((a|t)-set(','))

Answer 2

Now it's working fine