def get_staff_grading_statistics(course_id, item_id):
"""
Returns the number of graded, ungraded, and in-progress submissions for staff grading.
Args:
course_id (str): The course that this problem belongs to
item_id (str): The student_item (problem) that we want to know statistics about.
Returns:
dict: a dictionary that contains the following keys: 'graded', 'ungraded', and 'in-progress'
"""
return StaffWorkflow.get_workflow_statistics(course_id, item_id)
