#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *prev;
    struct node *next;
}node;
node*head=NULL,*tall;
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->next=newnode;
    tail=newnode;
 }
}
void display(){
    node *itr;
    for(itr=heaf;itr!=NULL;itr=itr->next){
        printf("%d",itr->data);
    }
}
int main(){
    int size,itr,num;
    scanf("%d",&size);
    if(size<=0){
        printf("Invalid input");
        return 0;
    }
    for(itr=1;itr<=size;itr++){
        scanf("%d",&num);
        create(num);
    }
    display();
    return 0;
}