#include<stdio.h>
#include<stdlib.h>
typedef struct node
{
    int data;
    struct node *left,*right;
}Node;
Node *root=NULL;
Node* create(int num)
{
    Node *newnode=(Node)malloc(sizeof(Node));
    newnode->data=num;
    newnode->left=NULL;
    newnode->right=NULL;
    return newnode;
}
Node* insert(Node *root,int num)
{
    if(root==NULL)
      return root;
    if(num<root->data)
      return root->left=insert(root->left,num);
    else if(num>root->data)
      return root->right=insert(root->right,num);
    return root;
}
void postorder(Node *root)
{
    if(root!=NULL)
    {
        postorder(root->left);
        postorder(root->right);
        printf("%d ",root->data);
    }
}
int main()
{
    int n,itr;
    scanf("%d",&n);
    if(n<0)
    {
        printf("Invalid input");
        return 0;
    }
    for(itr=0;itr<n;itr++)
    {
        scanf("%d",&num);
        insert(num);
        
    }
    postorder(root);
    return 0;
}