// editor1
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node*next;
    struct node*prev;
}Node;
Node*head=NULL,*tail;
void create(int num){
    Node*newNode=(Node*)malloc(1 *sizeof(Node));
    newNode->data=num;
    newNode->next=NULL;
    newNode->prev=NULL;
    if(head==NULL){
        head=newNode;
        tail=newNode;
    }
    else{
        newNode->prev=tail;
        tail->next=newNode;
        tail=newNode;
    }
}
void delete(int val){
    if(head->data==val){
        head=head->next;
        head->prev=NULL;
    }
    else(tail->data==val)
        prev->tail->next=NULL:
}
void display(){
    Node*i;
    for(i=head;i!=NULL;i=i->next){
        printf("%d ",i->data);
    }
}
int main(){
    int size,num,i;
    scanf("%d",&size);
    create(num);
    display();
    return 0;
    
    
}