class Program01 {
    public static void main(String args[]) {
        char ch1 = 'a';
        char ch2 = 'a';
        char ch3 = 'c';
        
        System.out.println(Character.compare(ch1, ch2)); // 0               
        System.out.println(Character.compare(ch1, ch3)); // -2
        System.out.println(Character.compare(ch3, ch1)); // 2       
    }
}