#include<stdio.h>
#include<stdlib.h>
typedef struct node
{
    struct node *next;
    struct node *prev;
}Node;

Node *head=NULL;
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->newNode=prev;
        tail=newNode;
    }
void dispaly()
{
    Node *itr;
    for(itr=0;itr<=0;itr++)
    {
        printf("%d",itr->data);
        return 0;    
    }
}
int main()
{
    int n,size,num,itr;
    scanf("%d",num);
    if(size<0)
    {
        scanf("%d",&size);
        return 0;
    }
    
        
    }
        
    
}