#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *next;
    struct node *prev;
}s2;

s2 *head=NULL,*tail=NULL;
s2 *temp=NULL;

void create(int num){
    s2 *new=(s2*)malloc(sizeof(s2));
    new->data=num;
    new->prev=NULL;
    new->next=NULL;
    if(head==NULL){
        head=new;
        tail=new;
    }else{
        tail->next=new;
        new->prev=tail;
        tail=new;
    }
}


void display(){
    s2 *i,*j;
    i=head;
    j=head->next;
    while(i!=NULL){
        if(i->data == j->data){
            continue;
        }else{
            printf("%d ",i->data);
        }
        i=i->next;
        j=j->next;
    }
int main(){
    int size,num;
    
    scanf("%d",&size);
    for(int i=1;i<=size;i++){
        scanf("%d",&num);
        create(num);
    }
    display();
   
    // duplicate();
    
    return 0;
}