/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class A {
    public void paint() {
        System.out.print("A");
        draw();
    }
    public void draw() {
        System.out.print("B");
        this.draw();
    }
}
 
class B extends A {
    public void paint() {
        super.draw();
        System.out.print("C");
        this.draw();
    }
    public void draw() {
        System.out.print("D");
    }
}
class EraonEdu {
    public static void main(String[] args) {
        A b = new B();
        b.paint();
        b.draw();
    }
}
 

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