// editor5
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    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);
     else if(num>root->data)
           root->right=insert(root->right,num);
          return root;
}
void postorder()
{
    if(root != NULL){
    postorder(root->left);
    postorder(root->right);
    printf("%d ",root->data);
}
}
int main()
{
    int size,num;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    for( int i=0;i<size;i++){
        scanf("%d",&num);
        root=insert(root,num);
    }
    postorder(root);
    return 0;
}