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my $message = uc(<>);
$message =~ s/[^A-Z0-9]//gi;                # remove punct, etc
$message =~ s/j/i/gi;
$message =~ s/q/O/gi;                      # replace [Qq] with [Oo]
$message =~ s/\s+//g;                      # remove spaces

my $message = uc <>;
$message =~ tr/A-Z0-9//cd;        # remove punct, etc
$message =~ tr/JQ/IO/;

my @range = ("Q","V","X","Y","Z",);

...

        my $i = int(rand(4));
        my $letter = $range[$i];

my @range = ("Q","V","X","Y","Z",);

...

        my $letter = $range[ rand @range ];