// editor5
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *next;
}Node;
void create(int num){
    Node *head=NULL,*tail;
    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 n,num,i;
    scanf("%d",&num);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    for(i=0;i<n;i++){
        if(!scanf("%d",&num)){
        scanf("%d",&n);
        return 0;
    }
    create(num);
}
    display();
    return 0;
}