Files.lines(Paths.get("my_file.txt"))
// exclude "empty" lines
.filter(line -> line.length() > 0)
// map every word
.map(line -> Arrays.asList(line.split("s")))
// flatten
.flatMap(List::stream)
// optional for non duplicates
// .distinct()
// optional for sorted
// .sorted(Comparator.reverseOrder())
// optional group by length
// .collect(Collectors.groupingBy((String::length)