7.py

num_map = [(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 num2roman(num):

    roman = ''

    while num > 0:
        for i, r in num_map:
            while num >= i:
                roman += r
                num -= i
    return roman

def value(r):
    if (r == 'I'):
        return 1
    if (r == 'V'):
        return 5
    if (r == 'X'):
        return 10
    if (r == 'L'):
        return 50
    if (r == 'C'):
        return 100
    if (r == 'D'):
        return 500
    if (r == 'M'):
        return 1000
    return -1


def romanToDecimal(str):
    res = 0
    i = 0

    while (i < len(str)):
        s1 = value(str[i])
        if (i + 1 < len(str)):
            s2 = value(str[i + 1])
            if (s1 >= s2):
                res = res + s1
                i = i + 1
            else:
                res = res + s2 - s1
                i = i + 2
        else:
            res = res + s1
            i = i + 1
    return res

inp = str(input())
c = list(str(inp))
u = 0
for i in c:
    u += 1
    if(i == "+"):
        break
a = c[:u-1]
b = c[u:]

ra = romanToDecimal(a)

rb = romanToDecimal(b)

rcem = ra+rb

cem = num2roman(rcem)

print(cem)