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

int main(void) {
int pid;

    pid= fork();
    if (pid == 0) {
        fprintf(stdout, "An");
        pid= fork();
        if (pid==0) {
            fprintf(stdout, "Bn");
            pid=fork();
            fprintf(stdout, "Cn");
        }
        else {
            wait(NULL);
            fprintf(stdout, "Dn");
        }
    }
    else {
        fprintf(stdout, "En");
        wait(NULL);
    }
    // your code goes here
    return(0);
}