#include <stdio.h>
 
int main(void) {
	// your code goes here
	return 0;
}
 

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

int main() {
    int p1, p2;
    
    // 第一次fork创建子进程1
    p1 = fork();
    if (p1 < 0) {
        perror("First fork failed");
        return 1;
    }
    
    if (p1 == 0) {
        // 子进程1：输出b
        putchar('b');
    } else {
        // 父进程：第二次fork创建子进程2
        p2 = fork();
        if (p2 < 0) {
            perror("Second fork failed");
            return 1;
        }
        
        if (p2 == 0) {
            // 子进程2：输出c
            putchar('c');
        } else {
            // 父进程：输出a
            putchar('a');
        }
    }
    
    return 0;
}