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    import java.io.*;
    import java.util.*;
    import java.text.*;
    import java.math.*;
    import java.util.regex.*;
    
    class Animal{
    	void walk()
    	{
    		System.out.println("I am walking");
    	}
    }
    class Bird extends Animal
    {
    	void fly()
    	{
    		System.out.println("I am flying");
    	}
        void sing()
        { 
            System.out.println("I am singing");
        }
    }
    
    public class Solution{
    
       public static void main(String args[]){
    
    	  Bird bird = new Bird();
    	  bird.walk();
    	  bird.fly();
          bird.sing();
    	
       }
    }