#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->next=NULL;
    newnode->data=num;
    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 itr,size,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;