#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 n;
    scanf("%d",&n);
    if(n<=0 || n>10){
        printf("Invalid input");
        return 0;
    }
    Node *root = NULL;
    for(int i=0;i<n;i++)
    {
        int val;
        scanf("%d",&val);
        if(val<-10000 || val>10000)
        printf("Invalid input");
        return 0;
    }
        root=insert(root,val);
    }
    postorder(root);
    return 0;
}