Try this see if it helps.
#!/usr/bin/perl -w
# gene.plx
# use strict;
my %hash = ();
while (<DATA>) {
chomp($_);
my ($dept,$email)=split(/:/);
$hash{ $dept } .= $email.',';
}
s/,\z// for values %hash;
print "\n";
while ( my ($key, $value) = each(%hash) ) {
print "$key => $value\n";
}
print "size of hash: " . keys( %hash ) . ".\n";
print '-' x (60),"\n";
__DATA__
6:car
1:human
3:fruits
9:flower
2:flower
5:human
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