class NoSuchStudentException(Exception):
    pass


class Garden():

    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, diagrm : str, students : list[str] = None):
        self.diagrm: str = diagrm
        self.rows: str = diagrm.splitlines()

        if students is not None:
            self.students = sorted(students)
        else:
            self.students = self.DEFULT_STUDENTS

    def plants(self, students_name : str):
        if students_name not in self.students:
            raise NoSuchStudentException(f"Učeň {student_name} neexistuje v tomto záhone.")

        students_index = self.students.index(students_name)

        start_col = student_index * 2

        top_plants = self.rows[0][start_col:start_col + 2]
        bottom_plants = self.rows[1][start_col:start_col + 2]

        raw_chars = list(top_plants + bottom_plants)

        result = [self.PLANT_MAP[char] for char in raw_chars]

        return result