-=> Quoting Nick Tolstikov to All <=-

 NT> Greetings, All!

 NT> How can i limit the line of user entering while standart readln
 NT> procedure runing? For example, i can see at the screen and enter only
 NT> x symbols.  

You *can't*.

You'll have to write your own input function that checks for
keypresses, processes them (including things like backspace, delete,
and maybe even arrow keys), and keeps track of what's been entered and
updates the display as needed.

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