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

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

N *head=NULL,*tail=NULL;
int count=0,flag=0;
int create(int val){
    N *newnode= (N*)malloc(sizeof(N));
    newnode->data=val;
    newnode->next=NULL;
    
    if(head==NULL){
        head=tail=newnode;
        
    }
    else{
        tail->next=newnode;
        tail=newnode;
    }
}

void display(){
    N *temp=head,*temp2=head;
 
    while(temp != NULL){
       count++;
        if(!(count % 2==0)){
            printf("%d ",temp->data);
        }
         temp=temp->next;
    }
    
     while(temp2 != NULL){
        flag++
        if(flag % 2 == 0){
            printf("%d ",temp2->data);
        }
         temp2=temp2->next;
    }
    
}

int main(){
    int n,val;
    scanf("%d",&n);
    for(int i=0;i<n;i++){
        if(!scanf("%d",&val)){
            printf("Invalid input");
            return 0;
        }
        create(val);
    }
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    display();
    
return 0;
}