#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;
    
}