#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node*next;
}Node;
Node*head=NULL,*tail;
void create( int N){
    Node*newNode=(Node*)malloc(sizeof(Node));
    newNode->data=N;
    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(i=0;i<=size;i++){
         if(!scanf("%d"&num));
           printf("Invalid input");
           return 0;
     }
     create(num);
}
display();
return 0;
}