text: #include "csapp.h"
  
  /* $begin waitprob0 */
  int main() 
  {
      if (Fork() == 0) {
  	printf("a");
      }
      else {
  	printf("b");
  	waitpid(-1, NULL, 0);
      }
      printf("c");
      exit(0);
  }
  /* $end waitprob0 */
  