import java.util.*;
class XNodeList {
    
    private XNodeList() { }
    
    public static String toString( List<XNode> xnodes ) {
        return XNodeList.toString( xnodes, "", true );
        }
    public static String toString( List<XNode> xnodes, String indent, boolean lotsaNewlines ) {
        String result = "";
        // map toString(.,.) over the list:
        for ( XNode x : xnodes ) {
            result += x.toString(indent,lotsaNewlines)
                   +  (lotsaNewlines ? "\n" : " ");
            }
        return result;
        }
    public static List<XNode> parse(Scanner s) {
        List<XNode> nodes = new ArrayList<XNode>();
        while (XNode.hasNext(s)) {
            nodes.add(XNode.parse(s));
            }
        return nodes;
        }
    static List<XNode> parse( String s ) { return XNodeList.parse(new Scanner(s)); }   

    }