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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();
              
        }
    }