class NoSuchStudentException(Exception):
    """Žiak nie je v zozname."""
    
DEFAULT_STUDENTS = [
    "Alena", "Boris", "Cyril", "Daniel", "Eva", "František",
    "Gitka", "Helena", "Ivana", "Jozef", "Karol", "Ladislav",]

PLANTS = {"G": "Tráva", "C": "Ďatelina", "R": "Reďkovky", "V": "Fialky"}
class Garden():
    def __init__(self, diagram, students=None):
        self.diagram = diagram
        self.rows = diagram.splitlines()
        names = DEFAULT_STUDENTS if students is None else students
        self.students = sorted(names)

    def plants(self, student):
        if not isinstance(student,str):
            raise TypeError("Student name has to be string")

        if student not in self.students:
            raise NoSuchStudentException(f"Student {student} does not exist")
            
        start = self.students.index(student) * 2
        return [PLANTS[code] for row in self.rows for code in row[start:start + 2]]