antrian = ([])

#fungsi tambah data antrian
def enqueue():
    if len(antrian) <= 7 :
        antrian.append(input('Masukkan data : ', ))
        print("".rjust(30, "-"))
        print('Data antrian sekarang : ', antrian)
    else :
        print("".rjust(30, "-"))
        print('OVERFLOW CONDITION')

#fungsi hapus data antrian
def dequeue():
    if (antrian != [] ) :
        antrian.pop(0)
        print('Data antrian sekarang : ', antrian)
    else :
        print('UNDERFLOW CONDITION')

#fungsi is empty
def isempty():
    if len(antrian) == 0:
        print('True')
    else :
        print('False')

def front() :
    if (antrian != []) :
        print('Front = (', antrian[0], ',', 'index ke-', antrian.index(antrian[0]),')')
    elif (antrian == []) :
        print('Front Kosong!')

def rear() :
    if (antrian != []) :
        print ('Rear = (', antrian[-1], ',', 'index ke-', antrian.index(antrian[-1]), ')')
    elif (antrian == []) :
        print('Rear Kosong!')

def create():
    if (antrian !=[]) :
        antrian.clear()
        print('Data antrian sekarang : Kosong')
    elif (antrian == []) :
        print('Data antrian sekarang : ', antrian)

def jumlah() :
    print ('Noel(Queue) = ',len(antrian))

#fungsi menu
def menu():
    print("")
    print("Program Queue".center(40, "="))
    print("")
    print("Queue = ", antrian)
    print(''.rjust(40,'_'))
    print('')
    print("1. Insert")
    print("2. Delete")
    print("3. IsEmpty")
    print("4. Create")
    print("5. Exit")

    print('')


while True :
    menu()

    front()
    rear()
    jumlah()

    mode = (input("Pilih mode:  "))
    if mode == '1' :
        enqueue()
    elif mode == '2' :
        print("".rjust(30, "-"))
        dequeue()
    elif mode == '3':
        print("".rjust(30, "-"))
        isempty()
    elif mode == '4' :
        create()
    elif mode == '5' :
        exit()

    print("".rjust(30, "-"))