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- courses = {}
- while True:
- command = input().split(" : ")
- course_name = command[0]
- if course_name == 'end':
- break
- student_name = command[1]
- if course_name not in courses.keys():
- courses[course_name] = [student_name]
- else:
- courses[course_name] += [student_name]
- for course_name, registered_students in courses.items():
- print(f"{course_name}: {len(registered_students)}")
- print(f'-- {" ".join(courses[course_name])}')
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