#include<stdio.h>
#include<stdlib.h>
typedef struct node
{
    int data;
    struct node*next;
}Node;
Node *head=NULL, *tail
void create(int num)
{
    Node *newNode=(Node*)malloc(*sizeof(Node));
    newNode->data=num;
    newnode->next=NULL;
    if(head==NULL)
    {
        head=newNode;
        tail=newNode;
    }
    else
    {
        tail->next=newNode;
        tail=newNode;
    }
}

void display()
{
    Node *i;
    for(i=head;i!=NULL;i=i->next);
    printf("%d",i->data);
}
 int main()
 {
     int size,i,num,pos;
     scanf("%d",&size);
     if(size<=0)
     {
         printf("invalid input");
         return 0;
     }
     for(i=1,i<=size,i++)
     {
         scanf("%d",&num);
     }
 }