#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(1*sizeof(node));
    newnode->data=num;
    newnode->next=NULL;
    if(head==NULL){
        head=newnode;
        tail=newnode;
    }
    else{
        tail->next=newnode;
        tail=newnode;
    }
}

node *first,*second;

void display(){
    node *itr;
    for(itr=h)
}

int main(){
    int n,num;
    scanf("%d,&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    for(int i=1;i<n;i++){
        scanf("%d",&num);
        create(num);
    }
    return 0;
}