how to use if in this list comprehension

Question

For an array of numbers, I must use list comprehension to find elements that:

1. Are divisible by 6

2. Their position is also divisible by 6

For example if the input is:

6 12 8 9 1 18

The output should be:

18

Here's what I have already done.

print(list(map(int, input().split()))[5::6])

I don't know how to find numbers that are divisible by 6.

Answer 1

That's how you can do it:

[el for idx, el in enumerate(lst) if idx % 6 == 0 and el % 6 == 0]

Note that typically indexes start from 0 and so the correct answer is 6, not 18. If you want to index from 1 then tweak the above:

[el for idx, el in enumerate(lst, 1) if idx % 6 == 0 and el % 6 == 0]