Ref here,
Go through this, and use the block Is in the list with particular name , if exisits get the index number. And with the help of index number get the tag name
But in this you should add, one variable (say tag name) and add this block (get keys get global response) from the dictionary, there by you can make a list of tag name. From the above method , after getting index get the tag name from this tag name list