/* p12b.c */

#include <stdio.h>
#include <error.h>

/* The mission of this function is to catenate */
/* the string pointed to by p2 to the end of   */
/* the string pointed to by p1                 */

void zstrcat(
char *p1,
char *p2)
{
   char *src;    /* source pointer      */
   char *dst;    /* destination pointer */

   dst = p1;
   src = p2;

/* Start by advancing dest to the end */
/* of the string pointed to by p1     */

   while (*dst != 0)
      dst = dst + 1;

/* Now tack on the string pointed to by p2 */

   while (*src != 0)
   {
      *dst = *src;
      dst = dst + 1;
      src = src + 1;
   }
   *dst = 0;
}

main()
{
    char *s1;
    char *s2;
    char *result;

    s1 = (char *)malloc(40);
    s2 = (char *)malloc(40);
    result = (char *)malloc(81);
    *result = 0;

    fgets(s1, 40, stdin);
    fgets(s2, 40, stdin);

    zstrcat(result, s1);
    zstrcat(result, " ");
    zstrcat(result, s2);

    fputs(result, stdout);

}