Palindrome Stacks

I am doing a program on palindrome using only stacks
my code works the only question I have is how can i run my program so that it ignores spaces and non letter symbols??

Code :

//importing packages needed to create class
import java.util.*;
import java.io.*;
//creating class which will call all methods from stacks and queues
public class StacksAndQueues
{
    //creating main method where methods will be called
    public static void main(String[] args)throws Exception
    {
        //initializing variables
        String input;
        String lower;
        String reversed = "";
        //creating scanner which will store the users input
        Scanner console = new Scanner(System.in);
        System.out.println("Please enter a String which you think is a palindrome");
        input = console.next();
        lower = input.toLowerCase();
 
        LinkedStackClass<Character> stringStack = new LinkedStackClass<Character>();
 
        for(char c: lower.toCharArray())
        {
            stringStack.push(c);
        }
        while(!stringStack.isEmptyStack())
        {
           reversed +=  stringStack.pop();
        }
 
        System.out.println(reversed);
        if(lower.equals(reversed))
            System.out.println(" The String entered IS a Palindrome!!!");
        else
            System.out.println(" The String entered IS NOT a Palindrome!!!");
        System.out.println(input);
        System.out.println(lower);
 
    }
}