static method: Grade Judgment Utility

In this problem, you will create a program that receives a score, determines a grade (A through F) using a static method GradeUtil.judgeGrade(), and displays the result to standard output.

Learning Objective: Understand how to utilize static methods as utility class

Create static method to judge grades. Learn mechanism of static methods that can be called directly without creating instance. Understand that methods declared with public static can be called in format ClassName.methodName().

Input

Line 1: Score (0-100)

Output

=== Grade Judgment ===
Score: [score] points
Grade: [grade]
```java

Grading criteria:
- 90 or above: A
- 80 or above: B
- 70 or above: C
- 60 or above: D
- Below 60: F

## Example 1: B Grade Judgment
Input: 85
Expected output:
```java
=== Grade Judgment ===
Score: 85 points
Grade: B
```java
Explanation: 85 points is 80 or above but less than 90, resulting in B grade. GradeUtil.judgeGrade(85) returns "B" and displays result.

## Example 2: A Grade Judgment (High Score)
Input: 95
Expected output:
```java
=== Grade Judgment ===
Score: 95 points
Grade: A
```java
Explanation: 95 points is 90 or above, resulting in A grade. Static methods can be called directly without instance.

## Example 3: D Grade Judgment (Boundary)
Input: 60
Expected output:
```java
=== Grade Judgment ===
Score: 60 points
Grade: D
```java
Explanation: 60 points is boundary value resulting in D grade. Static method works correctly even at boundary values.