Classes More Than 5 Students

Task: Write a solution to find all the classes that have at least five students.

Table: Courses

+-------------+--------------+
| Column Name | Type         |
+-------------+--------------+
| student     | varchar(255) |
| class       | varchar(255) |
+-------------+--------------+

Input: Courses table:

+---------+----------+
| student | class    |
+---------+----------+
| A       | Math     |
| B       | English  |
| C       | Math     |
| D       | Biology  |
| E       | Math     |
| F       | Computer |
| G       | Math     |
| H       | Math     |
| I       | Math     |
+---------+----------+

Output:

+-------+
| class |
+-------+
| Math  |
+-------+