// editor3
// editor2
#include<stdio.h>
#include<stdlib.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);
    }
    if(num<root->data){
        root->left = insert(root->left,num);
    }
    else if(num>root->data){
        root->right = insert(root->right,num);
    }
    return root;
}

void inorder(Node *root){
    if(root!=NULL){
        postorder(root->left);
        printf("%d ",root->data);
        postorder(root->right);
        
    }
}

int main(){
    int n,num,itr;
    scanf("%d",&n);
    if(n<=0){
        printf("Invalid input");
        return 0;
    }
    for(itr=0;itr<n;itr++){
        scanf("%d",&num);
        if(num<=0){
            printf("Invalid input");
            return 0;
        }
        root=insert(root,num);
    }
    inorder(root);
    return 0;
    
}