#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *prev;
    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;
    newnode->prev=NULL;
    if(head==NULL){
        head=newnode;
        tail=newnode;
    }
    else{
        tail->next=newnode;
        newnode->prev=tail;
        tail=newnode;
    }
}
void display(){
    node *itr;
    for(itr=head;itr!=NULL;itr=itr->next){
        printf("%d",itr->data);
    }
}

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