// editor3
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node*next;
    struct node*prev;
    
}node;
node*head=NULL,*tail,*iter;
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{
    tail->next=newnode;
    tail=newmode;
}
    
}
void display(){
    node*itr;
    for(itr=head;itr!=NULL;itr=itr->next){
        printf("%d ",itr->data);
    }
    int i,n,num;
    scanf("%d",&n);
    if(n<=0)
    
    
    
    
    {
    
    
    
    
    printf("Invalid input");
    return 0;
}
create(num);
display();
return 0;

}