import java.util.*;

public class Util
{
    public static final int NEWLINE = 10;

    public static String outputToString (LinkedList<String> output)
    {
        Iterator<String> iter = output.descendingIterator();
        String toReturn = "";

        while (iter.hasNext())
        {
            int v = Integer.getInteger(iter.next());

            toReturn += (char) v;
        }

        return toReturn;
    }

    private Util ()
    {
    }
}
@@ -159,16 +159,20 @@
         
+List
 Iterator
@@ -198,18 +198,12 @@
 put.
-descending
+list
 Iter
@@ -298,46 +298,70 @@
     
-int v = Integer.getInteger(iter.next()
+String s = iter.next();%0A            int v = Integer.parseInt(s
 );%0A%0A

Update Util.java