input: def print_grade_table(students):
      """Prints a formatted table of grades for a given set of students.
      Example:
      students = [
          {'name': "John", 'grade': 92},
          {'name': "Alice", 'grade': 95},
          {'name': "Bob", 'grade': 87}
      ]
      >>> print_grade_table(students)
      Name                Grade
      ------------------------
      John                92
      Alice               95
      Bob                 87
      """
output:     print("Name                Grade")
      print("------------------------")
      for student in students:
          print(f"{student['name']:<20}{student['grade']}")