import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
  public static void main (String[] args) throws java.lang.Exception
  {
    Integer a = null;

    try {
      boolean ignored = a == 1;
    } catch (NullPointerException ex) {
      System.out.println("Unboxing");
      return;
    }

    System.out.println("Boxing");
  }
}