import java.io.*;
import java.util.*;

class ListRead
{

 public static List readCharList(BufferedReader in) 
 throws CharListFormatException,IOException
 {
  StringTokenizer chars;
  String token,str=in.readLine().trim();
  List l1,l2;
  if(str.charAt(0)!='['||str.charAt(str.length()-1)!=']')
     throw new CharListFormatException();
  str=str.substring(1,str.length()-1);
  chars = new StringTokenizer(str,","); 
  l1=LinkedList.empty();
  while(chars.hasMoreTokens())
     {
      token=chars.nextToken();
      if(token.length()!=1)
         throw new CharListFormatException();
      l1=l1.cons(new Character(token.charAt(0)));
     }
  l2=LinkedList.empty();
  while(!l1.isempty())
     {
      l2=l2.cons(l1.head());
      l1=l1.tail();
     }
  return l2;
 }

 public static List readIntList(BufferedReader in) 
 throws IntListFormatException,IOException
 {
  StringTokenizer ints;
  String token,str=in.readLine().trim();
  List l1,l2;
  int n;
  if(str.charAt(0)!='['||str.charAt(str.length()-1)!=']')
     throw new IntListFormatException();
  str=str.substring(1,str.length()-1);
  ints = new StringTokenizer(str,","); 
  l1=LinkedList.empty();
  while(ints.hasMoreTokens())
     {
      token=ints.nextToken();
      try {
           n=Integer.parseInt(token);
          }
      catch(NumberFormatException e)
          {
           throw new IntListFormatException();
          }
      l1=l1.cons(new Integer(n));
     }
  l2=LinkedList.empty();
  while(!l1.isempty())
     {
      l2=l2.cons(l1.head());
      l1=l1.tail();
     }
  return l2;
 }
 
}