convert the following from java to swift

Class Q02: public class Q02 { public static void main(String[] args) { String sentence = "Text processing is hard!"; int position = sentence.indexOf ("hard"); System.out.println (sentence); System.out.println ("012345678901234567890123"); System.out.println ("The word "hard" starts at index" + position); sentence = sentence.substring(0, position) + "easy!"; sentence = sentence.toUpperCase(); System.out.println ("The changed string is:"); System.out.println (sentence); } }