Comparison of two text lists with percentage information

Игорь
Employer

[no-member:pro]Игорь[/no-member:pro]

2 projects
Project parameters
Type of cooperationOne-time project
Prepaymentwithout prepayment
Payment methodsBank transfer, Electronic money
Acceptance of requestsfrom until Apr 25, 2019
Project description
There is an A.txt file (main list) - a regular text file in the form of a list, in it, let's say 720 items.
There are X.txt, Y.txt and Z.txt (sub-lists) files, also text files in the form of a list, each with 100 points.
You need a program that compares these lists. If X.txt and A.txt have 5 points, then the program should give me a “5%” rating. That is, interest should only be counted against sub-lists. It is necessary that 10 lists can be downloaded simultaneously to the program.
The programming language is not important, I have Vin 10, x64, as long as it works as it is easier - so let it be written.
I don’t know how to negotiate the market value either.
Project author: [no-member:pro]Игорь[/no-member:pro]