def readSpools(mode):
    if mode == 'a':
        spools = int(input('Enter the number of spools ordered: '))
        while spools < 1:
            print('Please enter a positive amount of spools.')
            spools = int(input('Enter the number of spools ordered: '))
    if mode == 'b':
        spools = int(input('Enter the number of spools in stock: '))
        while spools < 1:
            print('Please enter a positive amount of spools.')
            spools = int(input('Enter the number of spools in stock: '))
    return spools


def readDeliveryOption():
    selection = input('Do you prefer rush or normal delivery?: ')
    while selection != 'rush' and selection != 'normal':
        print('Please enter either rush or normal.')
        selection = input('Do you prefer rush or normal delivery?: ')
    return selection


def readyToShip(a, b):
    if a < b:
        ready = a
    else:
        ready = b % a

    return ready


def backOrdered(a, b):
    if a < b:
        back = 0
    else:
        back = a % b
    return back

def shippingCharges(a, b):
    shippingCost = a * b
    total = a * 100 + shippingCost
    return shippingCost, total


def main():
    option = input('Do you want to continue processing spools order status (Y/N): ').upper()
    while option != 'Y' and option != 'N':
        print('Please enter either Y or N')
        option = input('Do you want to continue processing spools order status (Y/N): ').upper()
    while option == 'Y':
        spoolsOrdered = readSpools('a')
        spoolsStock = readSpools('b')
        deliveryMode = readDeliveryOption()
        spoolsReady = readyToShip(spoolsOrdered, spoolsStock)
        spoolsBack = backOrdered(spoolsOrdered, spoolsStock)
        if deliveryMode == 'rush':
            shippingRate = 15.00
        else:
            shippingRate = 10.00
        shippingCost, totalCost = shippingCharges(spoolsReady, shippingRate)
        print('Spools ready to ship: ' + str(spoolsReady))
        print('Spools on back order: ' + str(spoolsBack))
        print(format('Shipping and handling:', '24s') + '$' + format(shippingCost, '.2f'))
        print(format('Total due:', '24s') + '$' +format(totalCost, '.2f'))
        option = input('Do you want to continue processing spools order status (Y/N): ').upper()
        while option != 'Y' and option != 'N':
            print('Please enter either Y or N')
            option = input('Do you want to continue processing spools order status (Y/N): ').upper()


main()