class IntSequence
{
// Sequence class

 private int[] array;
 private int count,current;
 final static int MAX=100;

 public IntSequence()
 {
  array = new int[MAX];
 }

 public void delete()
 {
  if(current<count)
     {
      for(int i=current+1;i<count;i++)
         array[i-1]=array[i];
      count--;
     }
 }

 public void add(int n)
 {
  for(int i=count;i>current;i--)
     array[i]=array[i-1];
  array[current]=n;
  current++;
  count++;
 }

 public void forward()
 {
  if(current<count)
     current++;
 }

 public void backward()
 {
  if(current>0)
     current--;
 }

 public String toString()
 {
  int i;
  String str="[";
  if(current==0)
     str+="^";
  if(count>0)
     {
      str+=array[0];
      for(i=1;i<count;i++)
         if(current==i)
            str+=",^"+array[i];
         else
            str+=","+array[i];
      if(current==count)
         str+=",^";
     }
  return str+"]";
 }
}