class NoSuchStudentException(Exception):
    """Raised when plants are requested for a student not assigned a plot."""
    pass



class Garden:
    DEFAULT_STUDENTS = [
        "Alena"
        "Boris"
        "Cyril"
        "Daniel"
        "Eva"
        "František"
        "Gitka"
        "Helena"
        "Ivana"
        "Jozef"
        "Karol"
        "Ladislav"
    ]

    PLANT_MAP = {
        "G":"Tráva",
        "C":"Ďatelina",
        "R":"Reďkovky",
        "V":"Fialky",
    }

    def __init__(self, diagram, students=DEFAULT_STUDENTS):
    self.students = sorted(students)
    self.rows = diagram.split("\n")

    def plants(self, student_name):
        if student_name not in self.students:
            raise NoSuchStudentException("Ziak neexistuje")

        index = self.student.index(student_name)
        start = index *2
        end = start +2

        plant_chars = self.rows[0][start:end] +self.rows[1][start.end]

        return [self.PLANT_MAP[char] for char in plant_chars]