from functools import partial
 
def sorted_symmetric_difference(sorted_a, sorted_b, done=object()):
    # O(n) time, O(1) space
    sorted_a, sorted_b = iter(sorted_a), iter(sorted_b)
    next_a, next_b = partial(next, sorted_a, done), partial(next, sorted_b, done)
 
    a, b = next_a(), next_b()
    while a is not done and b is not done:
        if a == b: # skip
            a = next_a()
            b = next_b()
        elif b < a:
            yield b
            b = next_b()
        else:
            yield a
            a = next_a()
 
    item, rest = (a, sorted_a) if b is done else (b, sorted_b)
    if item is not done:
        yield item
        #### Python 3.3
        ####yield from rest
        for item in rest:
            yield item
 
 
import ast
 
a, b = [ast.literal_eval(input()) for _ in range(2)]
print(list(sorted_symmetric_difference(a, b)))
 

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WzEsMiw1LDcsOV0KWzEsMiw0LDgsOV0=

[1,2,5,7,9]
[1,2,4,8,9]