count "F" letters.

[Gość: ABeCe]

in the sentence below count all F letters and write how many of them you can
see.



FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

[Gość: mona]

There are 6 letters "f" as far as I can see. The trick is as old as hills.
You usually read content words, not paying too much attention to the function
words. That's all.