Piglatin Phrases Translator Not Working

My code shows no errors but when I type something in to get translated I get this error: Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 3 I don't know how to fix it so can you please tell me how. Here is the code:

import java.util.Scanner;
   static String input = "";
static String translation = "";
public static void main(String[] args) {

//method to retrieve string, turn into pig latin, and return string
    //breaks words into strings then pig latin
//pig latin = 
//if word begins with consonant, first letter moved to end and added 'ay' to end
//if word begins with vowel, add 'way' to end


    Scanner igLatinpay = new Scanner(System.in);
    System.out.println("Please type something to turn into pig latin.");
    input = igLatinpay.nextLine().toLowerCase();
    System.out.println(translatedPhrase(input));
    //System.out.println(pigLatin(translatedPhrase(input)));
   }

  //    public static String[] pigWords(String big)
  //    {
  //        //breaks string into an array of words
  //        int k = 0;
  //        int c = 0;
  //        String[] myWords = new String[big.length()];
  //        for(int j = 0; j < big.length(); j+=1)
  //        {
  //            if(big.charAt(j) == ' ')
  //            {
  //                myWords[c] = big.substring(big.charAt(k), j);
  //            }
  //            
  //            k = j+1;
  //            c+=1;
  //        }
  //        return myWords;
  //    }

public static String translatedPhrase(String word)
{        
        //combines translated words into one string
    String passDatLatin = "";
    String[] words = input.split(" ");
    for(int counter = 0; counter < words.length; counter +=1)
    {
        translation += pigLatin(words[counter]) + " ";
 //            passDatLatin = words[counter];
 //            System.out.print(pigLatin(passDatLatin) + " ");
    }
    return translation;
}

public static String search4Vowel(String piggy)
{
    char[] vowels = {'a', 'e', 'i', 'o', 'u'};
    int end = piggy.length() - 1;//for horses, end is 5
    for(int k = 0; k < piggy.length(); k += 1)//goes four times
    {
       for(int c= 0; c < vowels.length; c += 1)
       {
           if(piggy.charAt(k) == vowels[c])//goes through string pigsFly and  
           finds where there is vowel
           {
                piggy = piggy.substring(k, end) + piggy.charAt(0) + "ay";
           }
           else//if there are no vowels at all in the word
           {
               piggy += "ay";
           }
       }
    }


    return piggy;
}

public static String pigLatin(String pigsFly)
{
    //TRANSLATES WORD
    //have if statements to check beginning letter with else condition for consonant
    //inside if's, do moving of letter and adding to end
    char[] vowels = {'a', 'e', 'i', 'o', 'u'};
    String m = "";
    int end = pigsFly.length() - 1;
    for(int i = 0; i < vowels.length; i += 1)
    {
        //if word begins with vowel
        if(pigsFly.charAt(0) == vowels[0] || pigsFly.charAt(0) == vowels[1] ||pigsFly.charAt(0) == vowels[2] || pigsFly.charAt(0) == vowels[3] ||pigsFly.charAt(0) == vowels[4])
        {
            m = pigsFly + "yay";
        }
        else//if word doesn't start with vowel
        {
            m = search4Vowel(pigsFly);
        }
    }
    return m;//new pig latin word
}}

Thank you in advance.