use strict;
use warnings;

foreach my $filename (@ARGV) {
    open my $fh, '<', $filename
      or  warn "Can't open $filename: $!"
      and next;

    my %saldi;
    while ( <$fh> ) {
        chomp;
        next if not /\S/; # Skip blank lines

        my @fields = split /,/;
        if ( @fields != 5 ) {
            warn "Bad number of fields in file '$filename' line $.";
            next;
        }

        my ( $department, $currency, $year, $type, $amount ) = @fields;
        $saldi{ $type } += $amount;
    }

    my ($basename) = ( $filename =~ m/^(\S+)\.txt/ )
      or warn;
    
    print "$basename\n";
    foreach my $type ( sort keys %saldi ) {
        my $total_amount = $saldi{$type};
        printf "\t%-7s\t%7.2f\n", $type, $total_amount;
    }

    close $fh
      or warn "Can't close $filename: $!";
}