use strict;
use warnings;
use List::MoreUtils qw(uniq);

my $char_at=10;
my $num_chars=50;
open my $fh, $ARGV[0]
#open my $fh, '<:encoding(UTF-8)', $ARGV[0]
    or die "Could not open '$ARGV[0]' $!";
my @trnAccounts;
while (my $line = <$fh>) {
    my $val = substr($line, $char_at, $num_chars);
    if ($val eq 'H' or $val eq 'T') {
        my $output = $line;
    }else {    
        chomp $line;
        next unless $line && length($line) >= $char_at;
        push @trnAccounts, substr($line, $char_at, $num_chars);
    }
}
my @unique_accounts = uniq(@trnAccounts);
for my $i (1..$#unique_accounts) {
    print $i, ":", $unique_accounts[$i], "\n";
}
print "total: ", scalar(@trnAccounts), "\n";
print "uniq : ", scalar(@unique_accounts), "\n";