classAlist=[]
classBlist=[]

nameAlist=[]
nameBlist=[]
nameABlist=[]

scoreAlist=[]
scoreBlist=[]
markListAB=[]
nameListAB=[]
scoreListAB=[]
bottom_score = 0
top_score = 100
count=0
import sys
global count

def addListAB():
    nameListAB.append(name)
    markListAB.append(mark)

#----------------------------------------------------------------------------------------------------------------

def Average():
    average = sum(markListAB)/len(markListAB)
    print("The average mark of both classes is :",average)

#----------------------------------------------------------------------------------------------------------------

def Top3():
    top3A = sorted(zip(classAlist,nameAlist))[:3]
    top3B = sorted(zip(classBlist,nameBlist))[:3]
    print("Top three in A is :", top3A)
    print("Top three in B is :", top3B)

#----------------------------------------------------------------------------------------------------------------

def deletionA():
    whichone=str(input("Which name would you like to delete?")).lower()
    scoreremove=int(input("Please enter the corressponding score too"))
    deleteAname()
    deleteAscore()

def deletionB():
    whichone2=str(input("Which name would you like to delete?")).lower()
    scoreremove2=int(input("Please enter the corressponding score too"))
    deleteBname()
    deleteBscore()
#-------------------------------------------------------------------------------------------------------------


def enter():
    illegalScore = mark > top_score or mark < bottom_score
    EXCELLENCE = 80
    MERIT = 60
    ACHIEVED = 40
    if illegalScore:
        print(mark,"is not a  legal exam score")
    else:
        if mark >= EXCELLENCE:
            print("Mark of  ", mark, " : Excellent")

        elif mark >= MERIT:
            print("Mark of  ", mark, " : Merit")

        elif mark >= ACHIEVED:
            print("Mark of  ", mark, " : Achieved")

        elif mark < ACHIEVED and mark > 0:
            print("Mark of  ", mark, " : Not Achieved")

        else:
            print("Mark of  ",mark, " : Absent")



#-------------------------------------------------------------------------------------------------------------

def deleteAname():
    try:
        nameAlist.remove(whichone)
    except ValueError:
        pass

def deleteAscore():
    try:
        classAlist.remove(scoreremove)
    except ValueError:
        pass

def deleteBname():
    try:
        nameBlist.remove(whichone2)
    except ValueError:
        pass

def deleteBscore():
    try:
        classBlist.remove(scoreremove2)
    except ValueError:
        pass
#-------------------------------------------------------------------------------------------------------------


def addingtolistA():
    classAlist.append(grade)
    nameAlist.append(name)
    scoreAlist.append(mark)
def addingtolistB():
    classBlist.append(grade)
    nameBlist.append(name)
    scoreBlist.append(mark)

#-------------------------------------------------------------------------------------------------------------

def inputs():
    global name, score, mark, classs, grade
    classs=str(input("Please enter the student's class (a or b) or press enter to go to deletion")).lower()
    if classs=="a":
        try:
                name=(input("Please enter the name of the student"))
                mark = int(input("What was your exam mark?  "))
                except Value error:
                    print ("not a number please enter a valid response!!")
                grade=mark
                enter()
                addListAB()

                addingtolistA()
                print ("class A:",nameAlist)
                print ("class A:",classAlist)


    if classs=="b":
            name=(input("Please enter the name of the student"))
            mark = int(input("What was your exam mark?  "))
            grade=mark
            enter()
            addingtolistB()
            addListAB()

            print ("class B:",nameBlist)
            print ("class B:",classBlist)

    answer=""
    answer=str(input("Would you like to put in another student?(Yes or No) or press enter to go to deletion"))



    if answer=="yes":
        inputs()
    if answer=="no":
        print ("Thanks for entering in your names!")



#-------------------------------------------------------------------------------------------------------------


answer=""
answer=str(input("Would you like to put in a new student?(type Yes or press anything else to end the program)"))
if answer=="yes":
    inputs()
else:
    print ("Thanks for using this program!")
response=str(input("Would you like to delete a value? Yes/No")).lower()

if response =="no":
    Average()
    Top3()
classresponse=str(input("What class is the person from? a/b")).lower()



if classresponse=="a" and response=="yes":
    deletionA()
    print (nameAlist)
    print (classAlist)

if classresponse=="b" and response=="yes":
    deletionB()
    print (nameBlist)
    print (classBlist)