#PLEASE DO NOT EDIT THIS CODE
#This code was generated using the UMPLE 1.38.0.8942.247e17422 modeling language!


class Student:
    def __init__(self, aNumber):
        self._number = aNumber
        self._mentor = None

    def setNumber(self, aNumber):
        self._number = aNumber
        return True

    def getNumber(self):
        return self._number

    def getMentor(self):
        return self._mentor

    def hasMentor(self):
        return self._mentor is not None

    def setMentor(self, aMentor):
        if aMentor is not None and aMentor.numberOfStudents() >= aMentor.maximumNumberOfStudents():
            return False
        existingMentor = self._mentor
        self._mentor = aMentor
        if existingMentor is not None and existingMentor is not aMentor:
            existingMentor.removeStudent(self)
        if aMentor is not None:
            aMentor.addStudent(self)
        return True

    def delete(self):
        if self._mentor is not None:
            placeholderMentor = self._mentor
            self._mentor = None
            placeholderMentor.removeStudent(self)

    def __str__(self):
        return (super().__str__() + "["
                + "number:" + str(self.getNumber())
                + "]"
                + "\n  mentor = " + ("null" if self.getMentor() is None else format(id(self.getMentor()), "x")))

#PLEASE DO NOT EDIT THIS CODE
#This code was generated using the UMPLE 1.38.0.8942.247e17422 modeling language!


class Mentor:
    def __init__(self, aName):
        self._name = aName
        self._students = []

    def setName(self, aName):
        self._name = aName
        return True

    def getName(self):
        return self._name

    def getStudent(self, index):
        return self._students[index]

    def getStudents(self):
        return tuple(self._students)

    def numberOfStudents(self):
        return len(self._students)

    def hasStudents(self):
        return len(self._students) > 0

    def indexOfStudent(self, aStudent):
        return next((i for i, x in enumerate(self._students) if x is aStudent), -1)

    @staticmethod
    def minimumNumberOfStudents():
        return 0

    @staticmethod
    def maximumNumberOfStudents():
        return 5

    def addStudent(self, aStudent):
        if any(x is aStudent for x in self._students):
            return False
        if self.numberOfStudents() >= self.maximumNumberOfStudents():
            return False
        existingMentor = aStudent.getMentor()
        if existingMentor is None:
            if not aStudent.setMentor(self):
                return False
        elif existingMentor is not self:
            if not existingMentor.removeStudent(aStudent):
                return False
            if not self.addStudent(aStudent):
                return False
        else:
            self._students.append(aStudent)
        return True

    def removeStudent(self, aStudent):
        index = next((i for i, x in enumerate(self._students) if x is aStudent), -1)
        if index < 0:
            return False
        del self._students[index]
        if not aStudent.setMentor(None):
            self._students.insert(index, aStudent)
            return False
        return True

    def addStudentAt(self, aStudent, index):
        if not self.addStudent(aStudent):
            return False
        if index < 0:
            index = 0
        if index > self.numberOfStudents():
            index = self.numberOfStudents() - 1
        del self._students[next((i for i, x in enumerate(self._students) if x is aStudent), -1)]
        self._students.insert(index, aStudent)
        return True

    def addOrMoveStudentAt(self, aStudent, index):
        if not any(x is aStudent for x in self._students):
            return self.addStudentAt(aStudent, index)
        if index < 0:
            index = 0
        if index > self.numberOfStudents():
            index = self.numberOfStudents() - 1
        del self._students[next((i for i, x in enumerate(self._students) if x is aStudent), -1)]
        self._students.insert(index, aStudent)
        return True

    def delete(self):
        for aStudent in tuple(self._students):
            aStudent.setMentor(None)

    def __str__(self):
        return (super().__str__() + "["
                + "name:" + str(self.getName())
                + "]")