Reading two big numbers from a file and multiplying them

I know there is another question about multiplying big numbers but I don't understand it. Could someone please kindly explain to me how to think this? How to do this? I don't need a code, i need to know the steps.
First of all, I have to read the two big numbers from a file, they are written each on a row. So this would look like:
assign(f,'numere.txt');
reset(f);
string:='';
while not eoln do begin
read(a);
string:=string+'a';
end;
and same for the other number?

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