import sys

f = open(sys.argv[1], "r")
for line in f:
    for n in line.split()[::-2]:
        sys.stdout.write(n + " ")

    print("");

##</code><code>##

use strict;
use warnings "all";

open(my $fh, "<", "$ARGV[0]") or die;
while (<$fh>)
{
    chomp;
    my $i = 0;
    map {print $i++ & 1 ? "" : "$_ "} reverse split(/ /);
    print "\n";
}
close $fh;