#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;
}