#include "stdio.h"

struct SNo
{
   int c;
   SNo * prox;
   SNo * ant;
};


void main()
{
   SNo * no;
   SNo * i;

   no = new SNo;

   no->c = 'A'+4;
   no->ant = new SNo;
   no->prox = new SNo;

   no->ant->c = 'A'+3;
   no->prox->c = 'A'+25;
   no->ant->ant = no->prox;
   no->prox->prox = NULL;
   no->ant->prox = no;
   no->prox->ant = no;

   for( i = no->ant ; i != NULL ; i=i->prox )
	 {
		 printf("%c",i->c);
   }
   printf("\n");

   for( i = no->prox ; i != NULL ; i=i->ant )
   {
     printf("%c",i->c);
   }
   printf("\n");

}