using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

[Serializable]
class Node {
  public int val;
  public Node left, right;
  public Node(int x) { val = x; }
}

[Serializable]
class BinaryTree {
  Node root = null;
  
  public void Insert(int x) {
    Node p = root, father = null;
    while (p != null) {
      father = p;
      if (x < p.val) p = p.left; else p = p.right;
    }
    p = new Node(x);
    if (root == null) root = p;
    else if (x < father.val) father.left = p;
    else father.right = p;
  }
  
  public bool Contains(int x) {
    Node p = root;
    while (p != null) {
      if (p.val == x) return true;
      else if (x < p.val) p = p.left;
      else p = p.right;
    }
    return false;
  }
  
  private void P(Node p) {
    if (p != null) {
      P(p.left);
      Console.WriteLine(p.val);
      P(p.right);
    }
  }
  
  public void Print() {
    P(root);
  }
}

public class Test {

  public static void Main(string[] arg) {
    // Initialization of the tree
    BinaryTree tree = new BinaryTree();
    foreach (string num in arg)
      tree.Insert(Convert.ToInt32(num));
      
    // Serialization
    FileStream s = new FileStream("out.txt", FileMode.Create);
    IFormatter f = new BinaryFormatter();
    f.Serialize(s, tree);
    s.Close();
    
    // Deserialization
    s = new FileStream("out.txt", FileMode.Open);
    BinaryTree tree1 = f.Deserialize(s) as BinaryTree;
    s.Close();
    
    if (tree1 != null) tree1.Print();
  }
}