class Child extends AncTree {
    String name;
    int yob;
    String eye;
    AncTree ma;
    AncTree pa;
    
    int size( /* Child this */ ) {
        return this.ma.size() + 1 + this.pa.size();
    }
    
    AncTree changeName( /* AncTree this, */ String name1, String name2 ) {
        new Child( this.name.equals(name1)  ?  name2  :  this.name
                 , this.eye
                 , this.yob
                 , this.ma.changeName(name1,name2)
                 , this.pa.changeName(name1,name2)
                 );
    }

    
    
    Child( String _name, int _yob, String _eye, AncTree _ma, AncTree _pa ) {
        this.name = _name;
        this.yob = _yob;
        this.eye = _eye;
        this.ma  = _ma;
        this.pa  = _pa;
        }
        
        
        
    
    }