#include <string.h>
#include <stream.h>
char *what(char *s)
{
   if (strlen(s) < 3) {
      char *news = new char[strlen(s)+1];
      strcpy(news,s);
      return news;
   }
   char *p = what(s+3);
   char *news = new char[strlen(p)+2];
   strcpy(news,s+strlen(s)-3);
   strcat(news,p);
   return news;
}
void main()
{
   char data[10];
   strcpy(data,"9819049"); /***/
   cout << what(data) << '\n';
}