# Название программы: AraRom #
# Создатель программы: ramses #
# E-mail создателя: moredarker@yandex.ru #
# ICQ создателя: 622221805 #
# Дата создания: 19 апреля 2011, день #
# Дата последнего изменения: 19 апреля 2011, день #
# ************* #
# Суть программы: Программа переводит арабские числа в римские. #
# Заметки: алгоритм перевода пугает количеством буков и ветвлений. #
# №0 ************* #
def arabic_roman(nums):
    def addition(num,length):
        def filling(length):
            zero = ['','']
            i = 1
            while i+1 < length:
                zero.append(zero[len(zero)-1] + '0')
                i += 1
            return zero
        return num[:2] + filling(length)[length-1-len(num[2:])] + num[2:]
    nums = addition('0d'+str(nums), 6)[2:]
    results = ''
    liters = {1:'I', 4:'IV', 5:'V', 9:'IX', 10:'X', 40:'XL', 50:'L', 90:'XC', 100:'C',
        400:'CD', 500:'D', 900:'CM', 1000:'M'}
    results += liters[1000] * int(nums[0])
    if int(nums[1]) == 0:
        results += ''
    elif 1 <= int(nums[1]) <= 3:
        results += liters[100] * int(nums[1])
    elif int(nums[1]) == 4:
        results += liters[400]
    elif int(nums[1]) == 5:
        results += liters[500]
    elif 6 <= int(nums[1]) <= 8:
        results += liters[500] + liters[100] * (int(nums[1])-5)
    else:
        results += liters[900]
    if int(nums[2]) == 0:
        results += ''
    elif 1 <= int(nums[2]) <= 3:
        results += liters[10] * int(nums[2])
    elif int(nums[2]) == 4:
        results += liters[40]
    elif int(nums[2]) == 5:
        results += liters[50]
    elif 6 <= int(nums[2]) <= 8:
        results += liters[50] + liters[10] * (int(nums[2])-5)
    else:
        results += liters[90]
    if int(nums[3]) == 0:
        results += ''
    elif 1 <= int(nums[3]) <= 3:
        results += liters[1] * int(nums[3])
    elif int(nums[3]) == 4:
        results += liters[4]
    elif int(nums[3]) == 5:
        results += liters[5]
    elif 6 <= int(nums[3]) <= 8:
        results += liters[5] + liters[1] * (int(nums[3])-5)
    else:
        results += liters[9]
    return results
# №1 ************* #
while True:
    try:
        num = int(input('Введите арабское число в диапазоне от 1 до 3999:'))
        if 1 <= num <= 3999:
            break
        else:
            print('Число должно быть в диапазоне от 1 до 3999.')
            continue
    except ValueError:
        print('Необходимо задать целое число, а не нечто другое.. Просьба повторить ввод.')
        continue
# №2 ************* #
print(arabic_roman(num))
# №3 ************* #

CONV_TABLE = ((1000, 'M'), (900, 'CM'), (500, 'D'), (400, 'CD'),
    (100, 'C'), (90, 'XC'), (50, 'L'), (40, 'XL'),
    (10, 'X'), (9, 'IX'), (5, 'V'), (4, 'IV'), (1, 'I'))

def arab_to_roman( number ):
   if number <= 0: return ''

   ret = ''
   for arab, roman in CONV_TABLE:
       while number >= arab:
           ret += roman
           number -= arab

   return ret

def roman_to_arab( txt ):
    txt = txt.upper()
    ret = 0
    for arab, roman in CONV_TABLE:
        while txt.startswith( roman ):
            ret += arab
            txt = txt[ len( roman ): ]
    return ret


for i in ( 0, 4, 8, 9, 31, 46, 99, 583, 888, 1668, 1989, 2009, 2010, 2011, 3999 ):
    arab = arab_to_roman( i )
    roman = roman_to_arab( arab )
    print i, arab, roman

def roman_arabic(string):
    liters = {1:'I', 4:'IV', 5:'V', 9:'IX', 10:'X', 40:'XL', 50:'L', 90:'XC', 100:'C',
        400:'CD', 500:'D', 900:'CM', 1000:'M'}
    liter = ['I','V','X','L','C','D','M']
    arr = []
    result = int()
    for i in liter:
        arr += [string.count(i)]
    entries = dict(zip(liter, arr))
    if entries['M']:
        if entries['M'] > 1:
            entries['M'] *= 1000
        else:
            if string[string.index('M')] == 1:
                entries['M'] = 900
    if entries['D']:
        if string[string.index('D')-1] == 'C':
            entries['D'] = 400
        else:
            entries['D'] = 500
    if entries['C']:
        if entries['M'] == 900 or entries['D'] == 400:
            entries['C'] = 0
        else:
            if string[string.rindex('C')-1] == 'X':
                entries['C'] -= 1
                entries['L'] = 90
            entries['C'] *= 100  
    if entries['L'] != 90:
        if entries['L'] and string[string.index('L')-1] == 'X':
            entries['L'] = 40
        else:
            entries['L'] = 50
    if entries['L'] == 90 or entries['L'] == 40:
        if string[string.rindex('X')-1] == 'I':
            entries['V'] = 9
            entries['I'] = 0
            entries['X'] = 0
        else:
            entries['X'] *= 10
    if entries['V'] and entries['V'] != 9:
        if string[string.rindex('V')-1] == 'I':
            entries['V'] = 4
            entries['I'] = 0
        else:
            entries['V'] = 5
    if entries['X'] and string[string.rindex('X')-1] == 'I':
        entries['I'] = 9
    else:
        entries['I'] *= 1
    return entries
result = int()
for i in roman_arabic('XI').values():
    result += i
    print(i)
print('')
print(result)