Help!!! I have WA#17!!!

1
a
<blog>
<friend>x<friend>b<friend>c</friend></friend></friend>
</blog>

Thanks beforehand

My AC prog gives that result:
a
1: c, x
2:
3:

Such data don't precence in tests.
My Ac program gives absolutely another answer.
Friends decription
<friend>x<friend>b<friend>c</friend></friend></friend>
incorrect because for main corresponding pair
<friend>-  </friend>
we have wrong name :x<friend>b<friend>c</friend></friend>
(contains simbols differ from latin letters and _)
In blog decription there are nothing about enclosed friend's
tags.
If we refuse wrong names answer must be:
a
1: c
2:
3:

This is incorrect test case.