#include <stdio.h>
#include <stdlib.h>
typedef struct node node;
struct node {
	int value;
	node* link;
};
node* pushBack(node* tail, int value) {
	node* newNode = (node*)calloc(1,sizeof(struct node));
	newNode->value = value;
	newNode->link = newNode;
	if (!tail) {
		tail = newNode;
	}
	else {
		node* next = tail->link;
		tail->link = newNode;
		newNode->link = next;
		tail = newNode;
	}
	return tail;
}
void printCircularList(node* tail) {
	if (!tail) return;
	node* p = tail->link;
	do {
		printf("%d ", p->value);
		p = p->link;
	} while (p != tail->link);
}

node* deleteNode(node * tail, int value) {
	if (!tail) return NULL;
	node* prev = tail;
	node* cur = tail->link;
	if (prev == cur) {
		if (cur->value == value) {
			free(cur);
			tail = NULL;
		}
		return tail;
	}
	do {
		if (cur->value == value) {
				node* del = cur;
				prev->link = cur->link;
				if (cur == tail)tail = prev;
				cur = cur->link;
				free(del);
		}
		else {
			prev = cur;
			cur = cur->link;
		}
	} while (cur != tail->link);
	return tail;
}
node* concatenateCircularList(node * tailA, node * tailB) {
	if (!tailA && !tailB) return NULL;
	if (!tailA) return tailB;
	if (!tailB) return tailA;
	node* headA = tailA->link;
	tailA->link = tailB->link;
	tailB->link = headA;
	return tailB;
}
int main() {
	node* a = NULL, * b = NULL;
	FILE* fp = fopen("A.txt", "r");
	for (int t; ~fscanf(fp, "%d", &t); )
		a = pushBack(a, t);
	fclose(fp);
	fp = fopen("B.txt", "r");
	for (int t; ~fscanf(fp, "%d", &t); )
		b = pushBack(b, t);
	fclose(fp);

	node * d = concatenateCircularList(a, b);
	printCircularList(d);
	puts("");
	fp = fopen("C.txt", "r");
	for (int t; ~fscanf(fp, "%d", &t); ) {
		d = deleteNode(d, t);
	}
	fclose(fp);
	printCircularList(d);
	return 0;
}