/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-03-02
 * Description: Test whether a sentence is a palindrome, iguore the case punctuation and spaces.
 * Assignment: #2 Question 3
 */

import java.util.Scanner;

public class TestPalindrome {
    public static void main(String[] args) {
        System.out.print("Enter a String: ");
        Scanner in = new Scanner(System.in);

        // read a line of input from the user
        String inStr = in.nextLine();

        // close the scanner object
        in.close();

        // convert the string to lower case
        String str = inStr.toLowerCase();

        // remove all the punctuation using Character.isLetter()
        // str = str.replaceAll("[^a-zA-Z0-9]", "");
        String str2 = str;
        str = "";
        for (int i = 0; i < str2.length(); i++) {
            if (Character.isLetter(str2.charAt(i))) {
                str += str2.charAt(i);
            }
        }

        // reverse the string
        String reverse = new StringBuffer(str).reverse().toString();

        // compare the two strings
        // if they are the same, the string is a palindrome
        // otherwise, it is not
        System.out.format("\"%s\" is %s a palindrome.\n", inStr,
                str.equals(reverse) ? "" : "not ");
    }
}