Iterating over a dictionary in Swift: how to loop through all keys and values

Hello! I recently started learning Swift and encountered a problem when working with dictionaries. I have a dictionary that stores student names and their grades: ```swift var studentGrades: [String: Int] = [ "Anna": 85, "Boris": 92, "Victor": 78, "Galina": 95 ] ``` I want to display all students and their grades in the format "Name: grade". I tried using a for-in loop, but I don't understand how to properly access each element. Here's what I tried: ```swift for student in studentGrades { print(student) } ``` This outputs something strange like `(key: "Anna", value: 85)`. I need it to simply output "Anna: 85". Also I want to: 1. Iterate only over keys (student names). 2. Iterate only over values (grades).