use strict;
use warnings;

my $found_match = 0;

while (<DATA>) {
   s/\s+$//;

   if (/^\d/) {
      $found_match = 0;
   }

   if (!$found_match && /^\d*\s+(LA.*)/) {
      print("$1\n");
      $found_match = 1;
   }
}

__DATA__
1  LA-1-00
2  CON-1-0
   LA-2-01
3  LA-03-2
   LA-03-02