#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 create(num);
    if(num < root->data) 
     root->left=insert(root->left,num);
    if(num > root->data)
     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 i,n,num;
    scanf("%d ",&num);
    if(n<0)
    {
        printf("Invalid input");
        return 0;
    }
    for(i=;i<n;i++)
    {
        scanf("%d",&num);
        root=insert(root,num);
    }
    postorder(root);
    return 0;
}