#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{
        newnode->next=tail;
        tail->next=newnode;
        tail=newnode;
    }
    
}
void del(){
    tail=tail->prev;
    tail->next=NULL
    
}
void display(){
    Node*itr;
    for(itr=head;itr!=NULL;itr=itr->next)
        printf("%d ",itr=itr->next);
        
}
int main(){
    
    int n,itr,num;
    scanf("%d",&num);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    for(itr=0;itr<n;itr++){
        scanf("%d",&num);
        create(num);
        
    }
    display();
    del();
    printf("\n");
    display();
    return 0;
    
    
    
}