class Human (object):
    firstname = ''
    lastname = ''
    middlename = ''
    birthday = ''
    address = ''

    def fullname(self):
        return "{} {} {}".format(
            self.lastname,
            self.firstname,
            self.middlename
        )


class Student (Human):
    id = ''
    course = 0
    teamlead = False
    _have_grant = False
    _grant_size = 0

    def __init__(self, f_name="Unnamed", m_name=None, l_name=None):
        self.firstname = f_name
        self.middlename = m_name
        self.lastname = l_name

    def __str__(self):
        return "Student #{}: {} {}.{}.".format(
            self.id,
            self.lastname,
            self.firstname[0],
            self.middlename[0]
        )

    def set_grant(self, size):
        if size > 0:
            self._have_grant = True
            self._grant_size = size
        else:
            self._have_grant = False
            self._grant_size = 0