#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,num,itr;
            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;
        }
    }
}