#include <stdio.h>
#include <stdlib.h>
struct List
{
    int data;
    struct List *next;
} * a;
struct List *cin();
void cout(struct List *head);
int main()
{
    a = cin();
    cout(a);
    return 0;
}
struct List *cin()
{
    struct List *head, *p1, *p2;
    head = malloc(sizeof(struct List));
    p1 = p2 = head;
    do
    {
        p2->next = p1;
        p2 = p1;
        scanf("%d", &p2->data);
        p2->next = NULL;
        p1 = malloc(sizeof(struct List));
    } while (p2->data != -1);
    return head;
}
//第二种 换汤不换药
// struct List *read()
// {
//     struct List *head, *p1, *p2;
//     head = malloc(sizeof(struct List));
//     p1 = p2 = head;
//     do
//     {
//         p2->next = p1;
//         p2 = p1;
//         scanf("%d", &p2->data);
//         p1 = malloc(sizeof(struct List));
//     } while (p2->data != -1);
//     p2->next = NULL;
//     return head;
// }
void cout(struct List *head)
{
    if(head->data==-1) return ;
    while (head)
    {
        printf("%d", head->data);
        head = head->next;
        if(head->data!=-1)
        printf(" ");
        if(head->data==-1)break;
    }
}