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