class Element {

    private int data;
    private Element next;
    
    Element(int data, Element next) {
        this.data = data;
        this.next = next;
    }
    
    int getData() {
        return data;
    }
    
    Element getNext() {
        return next;
    }
    
    void setNext(Element next) {
        this.next = next;
    }
        
    boolean contains(int data) {
        if (this.data == data) {
            return true;
        }
        if (next == null) {
            return false;            
        } else {
            return next.contains(data);
        }
    }
    
    int size() {
        if (next == null) {
            return 1;
        } else {
            return 1+next.size();
        }
    }
    
    String toString(boolean reverse) {
        if (next == null) {
            return data+"";
        } else {
            String res = next.toString(reverse);
            if (reverse) 
                return res+","+data;
            else 
                return data+","+res;            
        }                
    }
    
    
    Element remove(int data) {
        if (this.data == data) {
            return next;
        } else {
            if (next != null) {
                next = next.remove(data);
            }
            return this;
        }
    }
    
    
    
    
}