stumped on do while loops

[txthrizzle]

Having a little trouble creating a program.. Well to start I need to create a program that will list all of the numbers between two input values, in either ascending or descending order. The user will enter a lower bound and upper bound number through a scanner object, and enter whether they want Ascending or Descending via A/a or D/d. if the user enters an incorrect A/a or D/d the user will be stated error or what not.. but here is my code.. any help would be greatly appreciated. thank you.

import java.util.Scanner;
 
public class assign4
{
 
	public static void main(String[] args)
	{
		int low, up;
		Scanner input = new Scanner(System.in);
		String A, a, D, d, check;
 
	do
	{
		System.out.print("Enter lower bound integer: ");
		low = input.nextInt();
		System.out.print("Enter upper bound integer: ");
		up = input.nextInt();
		System.out.println("Lower bound: " + low);
		System.out.println("Upper bound: " + up);
	}
	while (low <= up);
	{	
		
			
		System.out.println("Error!! lower bound must be smaller.");
	}
	
	
		System.out.print("Would you like Ascending or Descending order? [A/a or D/d]: ");
 
		A = input.check;
		a = input.check;
		D = input.check;
		d = input.check;
		
	while (check.equals("A,a"));
	{
		System.out.println(low + 1);
 
	}	
	while (check.equals("D,d"));
	{
	System.out.println(top - 1);
	}
 
}
}