What is the output of the following Java Program?

class First 
{ 
 public First() { System.out.println("a"); } 
} 
 class Second extends First 
{ 
 public Second() { System.out.println("b"); } 
} 
 class Third extends Second 
{ 
 public Third() { System.out.println("c"); } 
} 
 public class MainClass 
{ 
 public static void main(String[] args) 
 { 
  Third c = new Third(); 
 } 
}