class Student:
    def __init__(self, name: str, gNumber: int, gpa: float):
        self.set_name(name)
        self.set_gNumber(gNumber)
        self.set_gpa(gpa)

    # --- Name ---
    def get_name(self) -> str:
        return self._name

    def set_name(self, value: str) -> None:
        if not isinstance(value, str):
            raise TypeError("Name must be a string")
        if not value.isalpha():
            raise ValueError("Name must contain only alphabetic characters")
        if not (1 <= len(value) <= 255):
            raise ValueError("Name must be between 1 and 255 characters")
        self._name = value

    # --- gNumber ---
    def get_gNumber(self) -> int:
        return self._gNumber

    def set_gNumber(self, value: int) -> None:
        if not isinstance(value, int):
            raise TypeError("gNumber must be an integer")
        if not (100000 <= value <= 999999):
            raise ValueError("gNumber must be a 6-digit number between 100000 and 999999")
        self._gNumber = value

    # --- GPA ---
    def get_gpa(self) -> float:
        return self._gpa

    def set_gpa(self, value: float) -> None:
        if not isinstance(value, (int, float)):
            raise TypeError("GPA must be a number")
        if not (0.0 <= value <= 6.0):
            raise ValueError("GPA must be between 0.0 and 6.0")
        self._gpa = float(value)

    def __str__(self) -> str:
        return f"Student(Name: {self._name}, gNumber: {self._gNumber}, GPA: {self._gpa:.2f})"