class Solution(object):

def romanToInt(self, s):

"""

:type s: str

:rtype: int

"""

d={'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000}

e={'IV':4,'IX':9,'XL':40,'XC':90,'CD':400,'CM':900}

num=0

i=0

k=0

while i<len(s):

try:

k=s[i]+s[i+1]

except:

ValueError

k=0

if k in e:

num+=e[k]

i+=2

else:

num+=d[s[i]]

i+=1

return(num)