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