import java.util.*;
import java.lang.*;
import java.io.*;
 
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		if( A() && B() || C() && D() ){
			System.out.println("done...");
		}
	}
 
	public static boolean A(){
		System.out.println("This is class A");
		return true;
	}
 
	public static boolean B(){
		System.out.println("This is class B");
		return true;
	}
 
	public static boolean C(){
		System.out.println("This is class C");
		return true;
	}
 
	public static boolean D(){
		System.out.println("This is class D");
		return true;
	}
 
}

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