#!perl
use strict;

my %tmp=();
while (<DATA>){
  chomp;
  if ( /(.*\D)?(\d+)$/ ){;
    my $key = pack "A50N",$1,$2;
    $tmp{$key} = $_;
  } else {
    warn "Data format error $_";
  }
} 
my @sorted =  map { $tmp{$_} }  sort keys %tmp;
print "$_\n" for @sorted;

__DATA__
123
blank_5_str_1
blank_6_str_10
blank_5_str_1
blank_6_str_12
blank_5_str_13
blank_6_str_14
blank_5_str_2
blank_5_str_31
blank_5_str_401
blank_5_str_9
blank_5_str_6
dlank_5_str_8
clank_5_str_7
blank_5_str_9
98