public class Main {

    public Main(String M) {
        System.out.println(M);
    }
    
    public static void main(String[] args) {
        I1 a = new C2();
        System.out.println("---------");
        Main M = C2.M;
    }
}

interface I1 {
    Main M = new Main("I1");
}

class C1 {
    public static final Main N = new Main("C1");
}

class C2 extends C1 implements I1 {
}