#! /usr/bin/perl -w

use strict;


# Read whole file into a list, this could be an open()ed filehandle
# instead of the DATA section from below
my @lines = <DATA>;

# Sort the list by comparing the numeric portion of the lines
my @sorted = sort {
   my ($numA) = $a =~ /^(\d+).*/;
   my ($numB) = $b =~ /^(\d+).*/;
   $numA <=> $numB
} @lines;

# Output the sorted list
{  
   # We never chomped, the lines still contain newlines,
   # so don't need a list separator
   local $" = "";
   print "@sorted";
}


__DATA__
1260896 abadeno
972     achin00
402     astamen
181847  azeleke
134     b005376
1       b005824