#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <fcntl.h>

int main (int argc, char **argv) {

 int o1 = open ("myoutput.txt",O_WRONLY|O_CREAT|O_TRUNC,0700);
 int pid = fork();
 if (pid==0) { //child
  for (char c = 'a'; c <= 'z'; c++)
   write (o1,&c,1);
  close (o1);
 } else { //parent
  for (char c = 'A'; c <= 'Z'; c++) {
   write (o1,&c,1);
   if (c == 'M') lseek (o1,0,SEEK_SET);
  }
  close (o1);
  wait (NULL);
 }
 return 0;
}