#include <stdio.h>
#include <stdlib.h>

struct node {
    int data;
    struct node *next;
};

// Provided Functions
struct node *create_node(int data);
void print_list(struct node *head);

int main(void) {

    struct node *head = NULL;

    // TODO: Read integers until EOF
    // For each integer, alternate inserting at tail 
    //      and inserting at head

    print_list(head);
    
    return 0;
}

// Mallocs a new node and returns a pointer to it
struct node *create_node(int data) {
    struct node *new_node = malloc(sizeof(struct node));
    new_node->next = NULL;
    new_node->data = data;
    return new_node;
}

// Prints a linked list
void print_list(struct node *head) {
    struct node *curr = head;
    while (curr != NULL) {
        printf("%d -> ", curr->data);
        curr = curr->next;
    }
    printf("X\n");
}