class problem3 { static int MAX_CHAR = 26; static void findAndPrintUncommonChars(String str1, String str2) { int present[] = new int[MAX_CHAR]; for (int i = 0; i < MAX_CHAR; i++) { present[i] = 0; }

    int l1 = str1.length();
    int l2 = str2.length();
    for (int i = 0; i < l1; i++)
    {
        present[str1.charAt(i) - 'a'] = 1;
    }
    for (int i = 0; i < l2; i++)
    {
        if (present[str2.charAt(i) - 'a'] == 1
            || present[str2.charAt(i) - 'a'] == -1)
        {
            present[str2.charAt(i) - 'a'] = -1;
        }
        else
        {
            present[str2.charAt(i) - 'a'] = 2;
        }
    }
    for (int i = 0; i < MAX_CHAR; i++)
    {
        if (present[i] == 1 || present[i] == 2)
        {
            System.out.print((char) (i + 'a') + " ");
        }
    }
}
public static void main(String[] args)
{
    String str1 = "characters";
    String str2 = "alphabets";
    findAndPrintUncommonChars(str1, str2);
}

}