interface I {
    string M1() => "I.M1";
    string M2() => "I.M2";
}

abstract class A : I {}

class C : A {
    public string M1() => "C.M1";
    public virtual string M2() => "C.M2";
}

class Program {
    static void Main() {
        I obj = new C();
        System.Console.WriteLine(obj.M1());
        System.Console.WriteLine(obj.M2());
    }
}