#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=Node;
        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("Invalidn input");
        return 0;
    }
    create(num);
    }
    display();
    return 0;
}