#include <stdio.h>
#include <stdlib.h>

main ()
{
  int c;
  char str[]="0x00";
  while (1)
    {
      c=getchar();
      if (c == EOF) exit(0);
      if (c != 10)
	{
	  str[2]=c;
	  str[3]=getchar();
	  putchar (strtol (str, NULL, 16));
	}
    }
}