CCF CSP认证 201312-2 ISBN号码

s = input()
count = 1
sum = 0
for i in s[:len(s)-1]:
    if i.isdigit():
       sum += int(i)*count
       count += 1
x = sum%11
if(x<10):
    result = str(x)
else:
    result = 'X'
if(s[len(s)-1]==result):
    print('Right')
else:
    print(s[:len(s)-1]+result)