A question on the order of a row of persons

[Deepurple]

I would like to ask what the proper article and preposition are in the following phrase.

"Middle row: (the/zero article)third on/from/to the left"

Thanks for advice.

 

[riverkid]

I would like to ask what the proper article and preposition are in the following phrase.

"Middle row: (the/zero article)third on/from/to the left"

Thanks for advice.

Here are some examples. There could be others.

A: Who do you mean?

B: The person in the third row, second/third/fourth from the right/left.

B: In the third row, the second/third/fourth one/person from the right/left.