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

struct Node {
    int n;
    struct Node *next;
};

struct Node *createNode(int n) {
    struct Node *elem = (struct Node *) malloc(sizeof(struct Node));
    elem->n = n;
    elem->next = NULL;
    return elem;
};

int main() {
    char end = ' ';
    int n;
    struct Node *head;
    struct Node *elem;
    struct Node *prev;
    for (int i = 0; i < 10; i++) {
        scanf("%d%c", &n, &end);
        elem = createNode(n);
        if (i == 0) {
            head = elem;
            prev = head;
            continue;
        }
        prev->next = elem;
        prev = elem;
        if (end == '\n')
            break;
    }
    int i = 0;
    while (head != NULL){
        printf("%d ", head->n);
        if(head->next!=NULL){
            head->next = head->next->next;
        }
        head = head->next;
    }
}