// 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(!*sizeof(node));
    newnode->data=num
    newnode->next=NULL;
   // newnode->prev=NULL;
   if(head==NULL){
       head=newnode;
       tail=newnode;
       
   }else{
       
   
   tail->next=newnode;
   tail=newnode;
}
}
void display(){
    node*itr;
    for(itr=head;itr!=NULL;itr=itr->next){
        printf("%d ",itr->data);
    }
}
int main(){
    int n,num,i;
    scanf("%d",&num);
    if(n<=0){
        printf("Invalid input");
        return 0;
        
    }
    for(i=0;i<n;i++){
        scanf("%d",&num);
        return 0;
    }
}