#include<stdio.h>
#include<stdlib.h>

typedef struct node{
    int data;
    struct node *next;
    
}Node;
Node *head=NULL, *tail;
void creation(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,num,itr;
    scanf("%d",&size);
    if(size<0){
        printf("Invalif input");
        return 0;
    }
    for(itr=1;itr<=size;itr++)
    if(!scanf("%d",&size)|| size<0){
        printf("Invalid input");
        return 0;
    }
    creation(num);
    }
    display();
    return 0;
    
    
    
}