This dumps something for me:

use strict;
use warnings;

our $test = {
    first => {
        one => { number => 1 },
        two => { number => 2 },
        three => { number => 3 }
    },  
    second => {
        one => { number => 1 }, 
        two => { number => 2 }, 
        three => { number => 3 }
    },  
    third => {
        one => { number => 1 }, 
        two => { number => 2 }, 
        three => { number => 3 }
    }   
};  

my $input = <STDIN>;
$input =~ s/\n$//;

my $dump = $test->{$input};

use Data::Dumper;
print Dumper( $dump ), "\n";


__END__

% myprog.pl
first
$VAR1 = {
          'three' => {
                       'number' => 3
                     },
          'one' => {
                     'number' => 1
                   },
          'two' => {
                     'number' => 2
                   }
        };
[download]

see also:

• chomp instead of s/\n$//
• perldsc