How to submit?

I've worked out a task in Pascal which uses input and output text file. The program works, but every time I try to upload it, I get 0/20. So I was wondering how to name my input and output files and how to name the program, I went through forums, and tried FAQ but couldn't find any solutions.

Just read from stanard input (read[ln] (var1, var2...)), and write to standard ouput (write[ln] (id1, id2, ...)). No assign, no reset or rewrite. As you does with 'sum of two numbers'.

Hvala :)