/* 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
	{
		Scanner sc = new Scanner(System.in);
 
        System.out.print("Entre com o comando: ");
        String entrada = sc.nextLine();
 
        ArrayList<String> posicoes = new ArrayList<String>(Arrays.asList(entrada.toUpperCase().split("")));
 
 
        //Se tiver um X e antes do tiver uma letra remove o X e a Letra:
        for (int i = 1; i < posicoes.size(); i++) {
            if (posicoes.get(i).equalsIgnoreCase("X") && posicoes.get(i-1).matches("[A-Z]*")){
                posicoes.remove(i);
                posicoes.remove(i - 1 );
            }
        }
 
        for (int j = posicoes.size()-1; j > 0 ; j--) {
            if (posicoes.get(j).equalsIgnoreCase("X") && posicoes.get(j-1).matches("[A-Z]*")){
                posicoes.remove(j);
                posicoes.remove(j - 1 );
                j -= 1;
            }
 
        }
 
        System.out.println(String.join("", posicoes));
	}
}

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QUFCQlhY

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