#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node*next;
}Node;

Node *head=NULL,*tail=NULL;
void create(int num){
    Node *newnode=(Node*)malloc(sizeof(Node));
    newnode->data=num;
    newnode->next=NULL
    if(head==NULL){
    head=newnode;
    tail=newnode;
}
void display(){
    node *itr;
    for(itr=head;itr!NULL;itr->next){
        printf("%d",itr->data);
    }
}
int main(){
    int size,num;
    scanf("%d",&size);
    for(size<=0){
        printf("Invalid input");
        return 0;
    }
    for(int itr=1;itr<=size;itr++){
        if(!scanf("%d",&num)){
            printf("Invalid input");
            return 0;
    }
    create (num);
    }
    display();
    return 0;
}
    }
}