class Solution(object):
def romanToInt(self, s):
"""
:type s: str
:rtype: int
"""
l=len(s)
r,i=0,0
roman={'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000,'CM':900,'CD':400,'XC':90,'XL':40,'IX':9,'IV':4}
while i<l:
if i<l-1 and roman.has_key(s[i:i+2]):
r+=roman[s[i:i+2]]
i+=2
else:
r+=roman[s[i]]
i+=1
return r