private static boolean check(String a, String b) {
        if (b.length() >= a.length()) {
            return false;
        }

        int bIndex = 0;
        for (char c : a.toCharArray()) {
            if (bIndex < b.length() && b.charAt(bIndex) == c) {
                bIndex++;
            }
        }

        return bIndex == b.length();
    }