/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
	String[] elementos = {"R","L","F","B","D","U","R'","L'","F'","B'","D'","U'","R2","L2","F2","B2","U2","D2"};
    String ranEle = getRandomValues(elementos, 10); //10 elementos aleatorios del array.
    System.out.println(ranEle);
 
	}
 
 
    private static String getRandomValues(String[] valores, int cantidad){
      String res = "";
      for (int i = 0; i < cantidad; i++){
        res += valores[new Random().nextInt(valores.length)] + " ";
      }
      return res;
    }
 
}

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