JAVA

I want to pass this test right way should be "ABC123"

assertFalse(CourseNumberCheck.isCourseNumberValid("171CIS")); assertFalse(CourseNumberCheck.isCourseNumberValid("C!S171")); assertFalse(CourseNumberCheck.isCourseNumberValid("CIS?71"));

assertFalse(CourseNumberCheck.isCourseNumberValid("CI171S"));