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    import java.io.; import java.util.; class Animal { void walk() { System.out.println("I am walking"); } } class Bird extends Animal { void fly() { System.out.println("I am flying"); 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();
    }
    

    }