class Solution:
def romanToInt(self, s: str) -> int:
converter = {
'I': 1,
'V' : 5,
'X' : 10,
'L' : 50,
'C' : 100,
'D' : 500,
'M' : 1000
}
num = 0
if 'IV' in s:
num += 4
s = s.replace('IV', '')
if 'IX' in s:
num += 9
s = s.replace('IX', '')
if 'XL' in s:
num += 40
s = s.replace('XL', '')
if 'XC' in s:
num += 90
s = s.replace('XC', '')
if 'CD' in s:
num += 400
s = s.replace('CD', '')
if 'CM' in s:
num += 900
s = s.replace('CM', '')
for roman, val in converter.items():
num += s.count(roman) * val
s.replace(roman, '')
return num