Symmetric Difference | Hackerrank Python Solution | English Explanation

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[tgjarvis]

i understood except one thing join function could you please tell me again
Anyways Thanks Sir

[pujithagaddale]

m=int(input())
s=set()
for i in range(m):
s.add(input())
n=int(input())
u=set()
for j in range(n):
u.add(input())
print(s.union(u))


am getting EOF error I am unable to understand...