题解 | #[NOIP2008]ISBN号码#
[NOIP2008]ISBN号码
https://www.nowcoder.com/practice/95712f695f27434b9703394c98b78ee5
list = input().split('-')
num = ''.join(list)
a,b = num[:-1],num[-1]
sum = 0
for i in range(len(a)):
sum += int(a[i]) * (i+1)
mod = str(sum % 11)
if b == mod:
print('Right')
elif b == 'X' and mod == '10':
print('Right')
else:
if mod == '10':
mod = 'X'
list[-1] = mod
new = '-'.join(list)
print(new)
#题解#
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