C:\Users\pmu>more first.pl
use warnings;
use strict;
use diagnostics;
my @arr = ('a'..'z');
for my $stuff (@arr) {
        print "$stuff ";
}

C:\Users\pmu>first.pl
a b c d e f g h i j k l m n o p q r s t u v w x y z
C:\Users\pmu>perl first.pl
'perl' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\pmu>