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

class Ideone
{
  public static void main (String[] args) throws java.lang.Exception
  {
    Integer a1 = 1, a1024 = 1024, b1 = 1, b1024 = 1024;
    
    if (a1 != b1 || a1024 == b1024) {
      System.out.println("Can't detect :(");
    } else if (a1024 == 1024 && b1024 == 1024) {
      System.out.println("Unboxing");
    } else if (a1 == 1 && b1 == 1) {
      System.out.println("Boxing");
    } else {
      System.out.println("Boxing without cache o_O");
    }
  }
}