class Solution:
    def romanToInt(self, s: str) -> int:
        value = []
        normal = {
            "I": 1,
            "V": 5,
            "X": 10,
            "L": 50,
            "C": 100,
            "D": 500,
            "M": 1000
        }
        notnormal = {
            "IV": 4,
            "IX": 9,
            "XL": 40,
            "XC": 90,
            "CD": 400,
            "CM": 900
        }


        result=0
        i=0
        notnormalb = ''
        while i < len(s):
            if (i + 1) < len(s):
                notnormalb = s[i] + s[i + 1]
                if notnormal.get(notnormalb):
                    result += notnormal.get(notnormalb)
                    i += 1
                else:
                    if normal.get(s[i]):
                        result += normal.get(s[i])
            else:
                if normal.get(s[i]):
                    result += normal.get(s[i])
            i += 1
        return result