private static final String SPACE_DELIMITER = " ";
    private static final String VOWELS_CHARS = "AaEeUuIiOoYy";

    private void sixthTask() {
        System.out.println("Sixth task");

        String[] sentences = requestStringsInput();

        System.out.println("Enter edge length of words to remove:");

        int edgeLength = Integer.valueOf(scanner.nextLine());

        for (String sentence : sentences) {
            String resultSentence = removeWordsSmallerThan(sentence, edgeLength);
            System.out.println(resultSentence);
        }
    }

    private String removeWordsSmallerThan(String sentence, int edgeLength) {
        StringBuilder sb = new StringBuilder();
        String[] words = sentence.split(SPACE_DELIMITER);

        for (String word : words) {
            if (word.length() == edgeLength && !isVowelChar(word.charAt(0)))
                continue;

            sb.append(word).append(SPACE_DELIMITER);
        }

        return sb.toString().trim();
    }

    private boolean isVowelChar(char ch) {
        return VOWELS_CHARS.contains(String.valueOf(ch));
    }

    private String[] requestStringsInput() {
        System.out.println("Enter count of strings to enter: ");

        int count = Integer.valueOf(scanner.nextLine());

        System.out.println("Enter " + count + " strings:");

        String[] strings = new String[count];

        for (int i = 0; i < count; i++) {
            strings[i] = scanner.nextLine();
        }

        return strings;
    }