public class StringUtil
{
    public static String reverseLetters(String str)
    {
        int len = str.length();
        if (len == 1)
            return  str;
        else
        {
            char lastletter = str.charAt(len-1);
            return lastletter + reverseLetters(str.substring(0, len-1));
        }
    }

    private static String removePunct(String str){
        if (str == null || str.length() < 1){
            return str;
        }
        else {
            if (str.length() > 1){
                if (str.charAt(0)<48 && str.charAt(0)>=32||str.charAt(0)>=58 && str.charAt(0)<=59){
                    return removePunct(str.substring(1, str.length()));
                }
                else{
                    return str.charAt(0) + removePunct(str.substring(1, str.length()));
                }
            }
            else{
                if ( !(str.charAt(0)<48 && str.charAt(0)>=32||str.charAt(0)>=58 && str.charAt(0)<=59)){
                    return str;
                }
                else
                    return "";
            }

        }
    }

    public static boolean checkPalindrome(String str)
    {
        str = str.toLowerCase();
        str = removePunct(str);
        if (str.equals(reverseLetters(str)))
        {
            return true;
        }
        else
        {
            return false;
        }

    }

    public static String translateSentence(String str) {
        str = str.trim();
        if (str == null || str.length() < 1)
        {
            return str;
        }
        //if the string is one word, piglatinate the one word.
        if (str.indexOf(' ') == -1)
        {
            if (checkVowels(str.substring(str.charAt(0))) == true)
            {
                return str + "yay";
            }
            if (checkVowels(str) == false)
            {
                return str + "ay";
            }
            else
            {
                return
            }
        }
        //if the string is multiple words, piglatinate the many words.
        else
        {

        }
}
    private static boolean checkVowels(String str)
    {
      if (str.indexOf('a') == -1
            && str.indexOf('e') == -1
            && str.indexOf('i') == -1
            && str.indexOf('o') == -1
            && str.indexOf('u') == -1
            && str.indexOf('A') == -1
            && str.indexOf('E') == -1
            && str.indexOf('I') == -1
            && str.indexOf('O') == -1
            && str.indexOf('U') == -1)
            return false;
      else
            return true;
     }
    private static String getLast(String str)
    {
        int len = str.length();

    }
}