use Data::Dumper;
while(<DATA>){
chomp;
my ($email,$domain) = split /\t/;
push @{$hash{$domain}},$email;
}
print join "\n", keys %hash,"\n";
print "Email:",$hash{'yahoo.com'}[0].'@yahoo.com';
__DATA__
ahlnpstx gmail.com
dghjklorsvwy hotmail.com
cdegijlmqrstvwxz yahoo.com
abegijknostv yahoo.com
abcefghjlqrtuyz hotmail.com
acghiknoprux hotmail.com
abceghlmrstwxy gmail.com
cdehiklmnqtwxyz gmail.com
bdjklmortvw hotmail.com
bdegjkmrsuxz gmail.com
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