How find number of links using 'Find Children activity'

Hi ,
Can any one please help me how to find children links under parent element using ‘Find children Activity’.

I am using find children activity for the same but i am getting all children to the parent .
How can i filter only ‘A’ tags.
We have Filter option for the same but how can i pass my condition into that.
wnd tag=‘a’/
As of now i am using like below condition but i am getting error.

Below condition ?

This condition is i am using


@prasanna.Ui can you give some additional infos e.g error. We cant see a hint on the screen shot.

in general:
the filter for find children should filter to a elements only.
the no of found elements can be retrieved with a count statement on the childrenlist: YourchildrenVariable.Count