Python 我得到；“运行时错误”；在Kattis中提交代码时

在Kattis中提交Python3代码时出现“运行时错误”？我用normal input（）检查了代码，它正常工作了。我认为我的提交格式有问题

与问题相关的链接是：

---

请共享a以及整个错误消息。此外，变量和函数名称通常应遵循带有下划线的

小写形式。我添加了对Kattis问题的引用和错误消息的图片，并更改了变量的名称。我假设它在
y=xx\u y[1]上失败
line-任何地方都没有定义这样的变量。我说的对吗，在Kattis上我们看不到有关问题的详细信息？至少行数有错误？
#!/usr/bin/env python
# coding: utf-8
# In[8]:

import sys

# get the input
for line in sys.stdin:
    x_y=line.split('')

    x=x_y[0]
    y=xx_y[1]

    n=len(X)
    Answer='no'
    # Remove the similar digits
    for i in range(n):
        if x[0]==y[0]:
            x=x[1:]
            y=y[1:]

    # by removing one mathc from the First digit, the second digit can be made 
    minus=['71','80','93','65','95','86','89']
    plus=['17','08','39','56','59','68','98']
    # By moving one match between the digits, they can be converted to each other
    zero=['06','09','23','35','69','60','90','32','53','96']

    if len(x)==2:
        if (((x[0]+y[0]) in minus) and ((x[1]+y[1]) in plus) or
            ((x[0]+y[0]) in plus) and ((x[1]+y[1]) in minus)or
            ((x[0]+y[0]) in zero) and ((x[1]+y[1]) in zero)):
            Answer='yes'
    elif len(x)==1:
        if ((x[0]+y[0]) in zero):
            Answer='yes'

    print(Answer)    


# In[ ]: