#!/usr/bin/perl

use strict;
use warnings;

$ARGV[0] =~ s/\+([^+]*)\+/unparse($1)/eg;
print $ARGV[0];
sub unparse {
    $_ = $_[0];
    return "/" unless $_;
    return "_" if $_ eq "-";
    return uc($_) if /^[a-z]$/;
    s/^x//;
    return chr hex $_;
}