ip = input()
s = ip.replace('-','')[:-1]
n = 0
for i in range(9):
    n += (i+1)*int(s[i])
x = '0123456789X'[n%11]
if ip[-1] == x:
    print('Right')
else:
    print(ip[:-1]+x)

第一次刷洛谷，不太懂，谢谢大佬们能帮帮萌新！