#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>

int vowel(char);
int main(int argc, char *argv[])
{
	int pid_a, pid_b, status;
	int fd1, fd2, n = 1, cont = 1;
	int pipe1[2], pipe2[2];
	char buf, c='1';

	fd1 = open(argv[1], O_RDONLY);
	fd2 = open(argv[2], O_RDWR | O_CREAT | O_TRUNC, 0644);
	pipe(pipe1);
	pipe(pipe2);
	pid_b =fork();
	if(pid_b == 0)
	{
		while(cont == 1)
			if((n = read(fd1, &buf, 1)) !=0)
			{
				if(vowel(buf))
					write(fd2, &buf, 1);	
				else
				{
					lseek(fd1, -1, SEEK_CUR);
					c = '1';
					write(pipe1[1], &c, 1);
					read(pipe2[0], &c, 1);
				}
			}
			else
			{
				cont = 0;
				write(pipe1[1], &c, 1);
				exit(0);
			}
	}
	if((pid_a = fork()) ==0)
	{
		read(pipe1[0], &c, 1);
		while(cont == 1)
		{
			if((n = read(fd1, &buf, 1)) !=0)
                        {
                                if(!vowel(buf))
                                        write(fd2, &buf, 1);   
                                else
                                {
                                        lseek(fd1, -1, SEEK_CUR);
					c = '1';
                                        write(pipe2[1], &c, 1);
                                        read(pipe1[0], &c, 1);
                                }
                        }
                        else
                        {
                                cont = 0;
                                write(pipe2[1], &c, 1);
                                exit(0);
                        }
		}
	}
			
	wait(&status);
	wait(&status);
	exit(0);
	
}

int vowel(char buf)
{
  	if(buf == 'a' || buf == 'e' || buf == 'i' || buf == 'o' || buf == 'u')
		return(1);
	else
		return(0);
}