When I typed in the code, it display errors like this: ./src/main/java/Main.java:2: error: class, interface, enum, or record expected String word = "dog"; ^ ./src/main/java/Main.java:5: error: class, interface, enum, or record expected String firstLetter = word.substring(0, 1).toLowerCase(); ^ ./src/main/java/Main.java:6: error: class, interface, enum, or record expected if (firstLetter.equals("a") || firstLetter.equals("e") || firstLetter.equals("i") || firstLetter.equals("o") || firstLetter.e