python 四个点RE不知道怎么改了

ISBN = input()
a=[]
recognizer = 0
new_ISBN = ""
for i in range(len(ISBN)):
    if ISBN[i] != '-':
        a.append(ISBN[i])
for i in range(9):
    recognizer += int(a[i]) * (i+1)
recognizer %= 11
if recognizer == int(a[9]):
    print("Right")
else:
    if recognizer == 10:
        new_ISBN = ISBN[:-1] + "X"
    else:
        new_ISBN = ISBN[:-1] + str(recognizer)
    print(new_ISBN)