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

int
main(void)
{
    setbuf(stdout, NULL);
    FILE *fp = fopen("eee", "r");

    int num, i=0;
    pid_t pid;
    while(fscanf(fp, "%d", &num) != EOF) {
            i++;
        fflush(fp);
        pid = fork();
        if (pid < 0) {
            printf("%d\n", -1);
            fflush(stdout);
            _exit(0);
        } else if (pid > 0) {
            waitpid(pid, NULL, 0);
            printf("%d\n", num);
            fflush(stdout);
            _exit(0);
        }
        //printf("sss");
    }
    printf("%d\n", i);
  //printf("Hello, Dcoder!");
  return 0;
}