def print_exam_schedule(exam_schedule):
    """
    Prints the exam schedule in a prettier format.

    Parameters:
    -----------
    exam_schedule (2D list): Departments for each exam block


    returns (NoneType): None
    """

    for i in range(len(exam_schedule)):
        print("Block " + str(i+1) + ": [" + ', '.join(exam_schedule[i]) + "]")

    return None