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    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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    
        Bird bird = new Bird();
        bird.walk();
        bird.fly();
        bird.sing();
    
    }
    

    }