题解 | #[NOIP2008]ISBN号码#
[NOIP2008]ISBN号码
http://www.nowcoder.com/practice/95712f695f27434b9703394c98b78ee5
s=input()
r=s.replace('-', '')
t=0
for indx, i in enumerate(r[:-1]):
t+=int(i)*(indx+1)
rcode=t%11
rcode = 'X' if rcode==10 else str(rcode)
if rcode==r[-1]:
print('Right')
else:
print(s[:-1]+str(rcode))
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