#include<stdio.h>
#include<stdlib.h>

typedef struct node{
    int data;
    struct node *next;
}Node;

Node *head=NULL , *tail;

void create(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,ind,num;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    for(ind=0;ind<size;ind++){
        if(!scanf("%d",&num)){
            printf("Invalid input");
            return 0;
        }
        create(num);
        display();
    }
}