Euler #89

def remake(n):
    value = 0
    skip = False
    for x in range(len(n)):
        if skip:
            skip = False
            continue
        try:
            if values[n[x]] < values[n[x + 1]]:
                value += (values[n[x + 1]] - values[n[x]])
                skip = True
                continue
        except IndexError:
            pass
        value += values[n[x]]
    length = 0
    for y in str(value):
        if y in "49":
            length += 2
        elif int(y) < 5:
            length += int(y)
        elif int(y) >= 5:
            length += (int(y) % 5) + 1
    return len(n) - length

values = {"M": 1000, "D": 500, "C": 100, "L": 50, "X": 10, "V": 5, "I": 1}
answer = 0
for a in list(open("roman.txt")):
    num = a.rstrip()
    while num[0] == "M":
        num = num[1:]
    answer += remake(num)
print(answer)