dear sir,

 can't you say that how  can i find end of input in this
problem, when there is no way to get input through a file
?!?
  thanks, horizon team.

I think u can use EOF !!!
It works very well!!!!

@lgoriThm

> dear sir,
>
>  can't you say that how  can i find end of input in this
> problem, when there is no way to get input through a file
> ?!?
>   thanks, horizon team.

when i use EOF my program didn't stop. How to use it?

> when i use EOF my program didn't stop. How to use it?

read it by character,then judge whether the ch is EOF
when u run your program on your computer ,EOF is Ctrl-z

good luck!