#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

main()
{FILE *fp;
 pid_t IsParent;
 // fprintf(stderr,"!\n"); 
 printf("!\n"); 
 IsParent=fork();
 if (IsParent) {
  _exit(0);
 }
 else {
  sleep(5);
 }
}