use strict;
use warnings;

my %res;
while (<DATA>)
{
	chomp;
    my ( $name, $rest ) = split /\t/;
    push @{ $res{$name} }, $rest;
}
for $a( sort keys %res )
{
    print "$a:". join( "~~", @{ $res{$a} } );
	print "\n";
}

__DATA__
nick	5
nick	10
george	2
peter	3
george	14
nick	20

##</code><code>##

george:2~~14
nick:5~~10~~20
peter:3