readline() & seek() ???

[DataSmash]

Hi group,
I have a text file that contains thousands of lines and each line is
256 characters long.

This is my task:
For each line in the file, move to the 25th character, if the
character is a "T",
move to the 35th character of the line and read 5 characters from
there.
Capture these 5 characters and write them to a new text file, each 5
characters separated by a comma.

I appreciate your help!
R.D.