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What if I wanted to remove those lines from the original file at the same time?

thx, awk version works fine for me

A file input:

3
4
6
8
10


B file input
aaa|sdftqwtegaerta|Adfgadfhgsa
bbb|asdgfasdgart|fghsdfhsdfhs
ccc|dag5dsgarf|fhsdfh7
ddd|da4dsgarf|fhsdfhsdhf
eee|dagsdgadsgarf|fhsdfhsdhf...

I have two files

file A which have a number in every row and file B which contains few hundred thousand rows with about 300 characters in each row (csv)

What I need is to extract whole rows...