class Parent {
    protected final String foo;
 
    public Parent(String foo) {
        init();
        this.foo = foo;
    }
    protected void init() {
 
    }
}
 
public class Main extends Parent {
 
    public Main(String foo) {
        super(foo);
    }
 
    @Override
    protected void init() {
        System.out.println(this.foo.toLowerCase());
    }
 
    public static void main(String[] args) {
        new Main("a");
    }
}
 

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