/* 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 Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		C obj = new C();
		System.out.println("a: "+obj.a+"b: "+obj.b+"c: "+obj.c);
	}
}
 
class A{
	int a;
	A(){
		this.a = 0;
	}
}
class B extends A{
	int b;
	B(){
		this.b = 10;
	}
}
class C extends B{
	int c;
	C(){
		this.c = 15;
	}
}

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