Can someone optimize my code?

Question

first_list = [1,2,3,4,5,6,7,8,9]
second_list = [10,11,12,13,14,15,16,17,18,19]

final_list = []

for x in first_list:
    if x % 2 != 0:
        final_list.append(x)
for y in second_list:
    if y % 2 == 0:
        final_list.append(y)

print(final_list)