// editor4
#include<stdio.h>
#include<stdlib.h>
typedef struct Node{
    int data;
    struct Node *next;
    struct Node *prev;
    
}node;
node *head=NULL,*tail;
void create(int num){
    node *newnode=(node*)malloc(1*sizeof(node));
    newnode->data=num;
    newnode->next=NULL;
    newnode->prev=NULL;
    if(head==NULL){
        head=newnode;
        tail=newnode;
        
    }
    else{
        tail->next=newnode;
        newnode->prev=tail;
        tail=newnode;
    }
}
void display(){
    node *j,*temp;
    node *itr;
    for(itr = head;itr!=NULL;itr = itr->next){
        printf("%d ",itr->data);
    }
    printf("\n");
    
    for(itr = head;itr!=NULL;itr=itr->next){
        j = itr->next;
        while(j!=NULL){
            if(itr->data==j->data){
                temp=j;
                j=j->next;
                if(temp->next!=NULL){
                    temp->next->prev=temp->prev;
                }
                temp->prev->next=temp->next;
                if(temp==tail){
                    tail=temp->prev;
                    
                }
                free(temp);
            }
            else
            j=j->next;
        }
    }
    for(itr=head;itr!=NULL;itr=itr->next){
        printf("%d ",itr->data);
    }
}
int main(){
    int n,num;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    for(int i=1;i<=n;i++){
        scanf("%d",&num);
        create(num);
    }
    div();
    return 0;
}