convert the following java code 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); } } Class Q03: import java.util.Scanner; public class 003 { public static void main(String[] args) { int numberOfBaskets, eggsPerBasket, totalEggs; Scanner keyboard = new Scanner (System.in); System.out.println ("Enter the number of eggs in each basket: "); eggsPerBasket = keyboard.nextInt (); System.out.println ("Enter the number of baskets:"); numberOfBaskets = keyboard.nextInt (); totalEggs = numberOfBaskets * eggsPerBasket; keyboard.close(); System.out.println ("If you have"); System.out.println (eggsperBasket + " eggs per basket and"); System.out.println (numberOfBaskets + " baskets, then"); System.out.println ("the total number of eggs is " + totalEggs); System.out.println ("Now we take two eggs out of each basket."); eggs PerBasket = eggsPerBasket - 2; totalEggs = numberOfBaskets * eggs PerBasket; System.out.println("You now have"); System.out.println (eggsPerBasket + " eggs per basket and"); System.out.println (numberOfBaskets + + " baskets."); System.out.println ("The new total number of eggs is " + totalEggs); } } Class 04: import java.util.Scanner; public class 004 { public static void main(String[] args) { int score; char grade; System.out.println ("Enter your score: "); Scanner keyboard = new Scanner (System.in); score = keyboard.nextInt (); keyboard.close(); if (score >= 90) grade = 'A'; else if (score >= 80) grade = 'B'; else if (score >= 70) grade = 'C'; else if (score >= 60) grade = ''; else grade = 'F'; System.out.println("Score = " + score); System.out.println ("Grade = " + grade); }