题解 | #[NOIP2008]ISBN号码#

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)