use strict;
die "Syntax: $0 <names> < djb-file > output-file" unless @ARGV == 1;
my %name_to_ip;
open(IN, "<".shift) or die;
while (<IN>)
{
    chomp;
    my ($ip, $name) = split /:/;
    $name_to_ip{$ip} = $name;
}
close IN or die;

while (<>)
{
    chomp;
    my ($name, $ip) = split /:/;
    print $name_to_ip{$ip} || $name, ":", $ip, "\n";
}