++$t, ++$c{$_} for map /\w/g, <>;
for ( sort keys %c ) {
    $p = sprintf '%3.2f', $c{$_} / $t * 100;
    printf "%-5s%5d%7s%%\n", $_, $c{$_}, $p;
}
print 'Distinct: ' . (scalar keys %c) . "\tTotal: $t\n"