Write a program which takes a student's score and outputs an alphabetical grade for it.

Use if, else if, and else clauses to categorize the grade based on the given ranges:

• If the grade is 90 or higher, print: "Grade: A".
• If the grade is between 80 and 89, print: "Grade: B".
• If the grade is between 70 and 79, print: "Grade: C".
• If the grade is between 60 and 69, print: "Grade: D".
• If the grade is below 60, print: "Grade: F".