#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;
}