Dear all I apologize if I am going to ask a question that may be easy

I'm trying to read a list of file in a specific directory that are all done in this way: word-number.box When the script find the file it should go elsewhere launching a different program on each individual file found with this structure. My main issue is how to put in the variable $filename text and scalar together.

$filename=print($a,$x,$c) ;
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This command is printing in the proper way but is not setting them in the $filename $a and $c are texts while $x is a number.

Here is the code:

#!/usr/bin/perl -w
$job="eman-ctf.b";
for ($x=3 ; $x <=4 ; $x++){
        $a='/sData/users/Musa/Necen/process/EspB-trunc/espbtrunc-imagi
+c-ctf/3-img-no-ctf/box/et3f-' ;
        $c='.box';
        $d=print($a,$x,$c) ;
        $filename = $d;
        print $d ;
        if (-e $filename) {
                   print "File Exists!";

  @_=($job,$x);
  system(@_) == 0
   or warn "system @_ failed ";
}
}
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Thank you in advance Max