public class WordBoolean {
    private static final String[] FIRST_ROW = {"q", "w", "e", "r", "t", "y", "u", "i", "o", "p"};
    private static final String[] SECOND_ROW = {"a", "s", "d", "f", "g", "h", "j", "k", "l"};
    private static final String[] THIRD_ROW = {"z", "x", "c", "v", "b", "n", "m"};

    public boolean wordCheck(String word) {
        int char_count = word.length();
        int counter1 = 0;
        int counter2 = 0;
        int counter3 = 0;

        String[] arrWord = word.split("");

            for (int i = 0; i < char_count; i++) {
                for (String element : FIRST_ROW) {
                    if (arrWord[i].equals(element)) {
                        counter1 = counter1 + 1;
                    }
                }
            }

            for (int i = 0; i < char_count; i++) {
                for (String element : SECOND_ROW) {
                    if (arrWord[i].equals(element)) {
                        counter2 = counter2 + 1;
                    }
                }
            }

            for (int i = 0; i < char_count; i++) {
                for (String element : THIRD_ROW) {
                    if (arrWord[i].equals(element)) {
                        counter3 = counter3 + 1;
                    }
                }
            }

        if (counter1 == char_count ||
                counter2 == char_count ||
                counter3 == char_count) {
            return true;
        }
        return false;
    }

    public static void main(String[] args) {
        WordBoolean newWord = new WordBoolean();
        System.out.print(newWord.wordCheck("qwer"));


    }
}