#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 (1 * 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);
    }
    else 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 size,i;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    for(i=1;i<=size;i++)
    {
        scanf("%d ",&num);
        root=insert(root,num);
    }
    postorder(root);
    return 0;
}