If you get WA(6) just change

while NOT (EOF) do

to

while NOT (SeekEOF) do

and your program may get AC, as mine one (0.03 sec, 377 Kb on Pascal ;] )

I understand why it happens (the last line of input is empty), but really cannot understand why was such test included to the testset. IMHO, it is unfairly tricky...

If you read numbers with function read(), then after last numbers read CR/LF symbols still remain in input stream, so eof() returns false, because it's really not the end of file.
In the test #6 I don't see any empty lines or something tricky.

Thanks.
My program crash on test #6
I just have changed:
while NOT (EOF) do begin  read(a,b); ... to
while NOT (SeekEOF) do begin  read(a,b); ...
and i've got AC!