import java.util.*;
import java.lang.*;
import java.io.*;

class Base {
}

class A extends Base {
    protected int a;
    protected int b;

    A (int a, int b) {
        this.a = a;
        this.b = b;
    }
    
    public String toString() {
        return "A [" + a + ", " + b + "]";
    }
}

class B extends Base {
    protected int a;
    protected int b;

    B (int a, int b) {
        this.a = a + b;
        this.b = a - b;
    }
    
    public String toString() {
        return "B [" + a + ", " + b + "]";
    }
}

class Main {
    protected static Base getB() {
        return new B(10, 40);
    }

    public static void main(String[] args) {
        System.out.println(getB());
    }
}