#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->prev=NULL;
    newnode->next=NULL;
    
    if(head==NULL){
        head=newnode;
        tail=newnode;
    }else{
        tail->next=newnode;
        newnode->prev=tail;
        tail=newnode;
    }
}

void bigdisplay(){
    Node *itr;
    for(itr=head; itr!=NULL; itr=itr->next){
        printf("%d", itr->data);
    }
}



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