#include <stdio.h>
#include <stdlib.h>
struct Node{
    int data;
    struct Node*next;
};
int main()
int n,val,i;
struct node*head =NULL,*temp =NULL,*newNode;
scanf("%d",&n);

    if(n<1 || n>10){
        printf("invalid input");
        return 0;
    }
    for(int i=0;i<n;i++){
        if(scanf("%d",&val)!=1||val<1||val>1000){
            printf("Invalid input");
        return 0;
        }
        newNode =(struct node*)malloc(sizeof(struct node));
    newNode->data=val;
    newNode->next=NULL;
    if(head==NULL){
        head=newNode;
        temp=newNode;
    }else{
        temp->next=newNode;
        temp=newNode;
    }
    }
    temp=head;
    while(temp!=NULL){
        printf("%d",temp->data);
        temp=temp->next;
    }
    return 0;
}