#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <sys/wait.h>

int main()
{
int n;
srand((unsigned)time(NULL));
pid_t pid=fork();


if(pid==0)
{
while(1)
{
fprintf(stderr, "%d",rand()%10);
sleep(1);
}
}
else
{
while(1)
{
fprintf(stderr, "%c",'A'+(rand()%26));
sleep(1);
}
}
}