py求助，第4个测试点会RE，有大佬能解决一下吗

a=input()
t=a.replace('-','')
t=list(t)
n=len(t)
#print(n)
for i in range(n-1):
    t[i]=int(t[i])
sum=0
for i in range(n-1):
    sum=sum+t[i]*(i+1)

x=sum%11
#print(x)
if x==10:
    x='X'

x=str(x)
if x==a[len(a)-1]:
    print('Right')
else:
    a=a[:-1]+str(x)
    print(a)