public static String twoStrings(String s1, String s2) {
    String maxstring = s1.length() > s2.length() ? s1 : s2;
    String smallstring = s1.length() <= s2.length() ? s1 : s2;
    Set<String> maxset = Arrays.stream(maxstring.split("")).collect(Collectors.toSet());
    Set<String> smallset = Arrays.stream(smallstring.split("")).collect(Collectors.toSet());
    int smallsetsize = smallset.size();
    smallset.removeAll(maxset);
    return smallsetsize == smallset.size() ? "NO" : "YES";
}