// editor1
#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;
    }
}
void display(){
    Node *itr;
    for(itr=head;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++){
            if(!scanf("%d",&num)){
                printf("Invalid input");
                return 0;
            }
            create(num);
        }
        display();
        return 0;
    
}