sufix

final Stream<String> stream;
// stream = Files.lines(path)
stream = Arrays.stream("11502 49 54321 6149 76149 123 123 502 4321 321 321 666".split(" "));
final Set<Integer> candidates = new TreeSet<>();
final Set<Integer> sufix = new TreeSet<>();
stream.forEach(s -> {
  final int length = s.length();
  if (????????)
    candidates.add(Integer.parseInt(s));
  else if (??????????)
    sufix.add(Integer.parseInt(????????????));
});
candidates.????????????(sufix);
System.out.println(candidates);