package ro.devmind;

import java.util.Scanner;

public class Ex3 {
  public static boolean isPalindromeIgnoreCasePRO(String sentence) {
    String lowerCaseSentence = sentence.toLowerCase();
    
    // filter sentence for non-letters characters using the StringBuilder class
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < lowerCaseSentence.length(); i++) {
      if (Character.isLetter(lowerCaseSentence.charAt(i))) {
        sb.append(lowerCaseSentence.charAt(i));
      }
    }
    
    String onlyLettersSentence = sb.toString();
    String onlyLettersSentenceReverse = sb.reverse().toString();
    if (onlyLettersSentence.equals(onlyLettersSentenceReverse)) {
      return true;
    }
    return false;
  }
  
  public static void main(String[] args) {
    // Test 1
    System.out.println("Test 1: " + isPalindromeIgnoreCasePRO(""));
    
    // Test 2
    System.out.println("Test 2: " + isPalindromeIgnoreCasePRO("Red rum, sir, is murder!"));

    // Test 3
    System.out.println("Test 3: " + isPalindromeIgnoreCasePRO("Was it a cat I saw?"));

    // Test 4
    System.out.println("Test 4: " + isPalindromeIgnoreCasePRO("Not a palindrom, I'm afraid.."));
    
    // Test 5
    System.out.println("Test 5: " + isPalindromeIgnoreCasePRO("Step on no pets."));
  }
}