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"""

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

"""

def roman_to_int(s:"str")->"int":

number = 0

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

for i in range(len(s)-1):

if roman[s[i]] < roman[s[i+1]]:

number -= roman[s[i]]

else:

number += roman[s[i]]

return number + roman[s[-1]]

if __name__ == "__main__":

roman = "DCXXI"

print(roman_to_int(roman))