/* 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                 */

char *zstrcat(
char *p1,
char *p2)
{
   char *r = p1;

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

   while (*p1++);
   p1--;

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

   while (*p1++ = *p2++);
   return(r);
}

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);

}