#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->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;
}