#include <stdio.h>
#include <stdlib.h>
typedef struct node node;
struct node {
	int value;
	node* link;
};
node* pushBack(node* tail, int value) {
	/*to do*/
}
void printCircularList(node* tail) {
	/*to do*/
}

node* deleteNode(node * tail, int value) {
	/*to do*/
}
node* concatenateCircularList(node * tailA, node * tailB) {
	/*to do*/
}
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;
}