#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<ctype.h>

typedef struct node{
    int data;
    struct node *left;
    struct node *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);
    }else if(num<root->data){
        root->left=insert(root->left,num);
    }else if(num>root->data){
        root->right=insert(root->right,num);
    }
    return root;
}

void post(node *root){
    if(root!=NULL){
        post(root->left);
        post(root->right);
        printf("%d ",root->data);
    }
}
int main(){
    int n,i,num;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    for(i=0;i<n;i++){
        scanf("%d",&num);
        root=insert(num);
        
    }
    post(root);
    return 0;
}