class quaylui {
    int b[] = new int[26];

    void quaylui(int i) {
        for (int k = 97; k <= 122; k++) {   //duyet cac ky tu co ma tu 97 ->122 : a->z
            b[i] = k;       // b[i] = ma ASCII
            if (i == 8) {   //Neu du 9 ky tu thi in ra
                for (int l = 0; l <= i; l++)
                    System.out.printf("%c", b[l]);
                System.out.print("\n");
            } else  //chua du 9 thi lap lai voi b[i+1]
                quaylui(i + 1);
        }

    }

    public static void main(String[] agrs) {
        quaylui ql = new quaylui();
        ql.quaylui(0);
    }

}