CoderByte challenge Letter Capitalise

coderbyte_letterCapitalise.java

import java.util.*; 
import java.io.*;

class Main {  
  public static String LetterCapitalize(String str) { 
    String[] words = str.split(" ");
    StringBuilder sb = new StringBuilder();
    for (String word : words) { // for each word
        if (Character.isLowerCase(word.charAt(0))) {// if first char is lower case
            char[] chars = word.toCharArray();
            chars[0] = Character.toUpperCase(chars[0]);
            sb.append(new String(chars));
        } else {
            sb.append(word);
        }
        sb.append(" ");
    }
    return sb.toString().trim();
  } 
  
  public static void main (String[] args) {  
    // keep this function call here     
    Scanner s = new Scanner(System.in);
    System.out.print(LetterCapitalize(s.nextLine())); 
  }   
  
}