Who is the third A

Shauna, Mona, Jenna, Melissa, Toby(he was only trying to protect Spencer), Spencer(she was only trying to protect her friends), and Alison is red coat, (the A team leader)

i think is toby but he dicho that he was trying to protect spencer and spencer was with the A team but she was only trying to look for answers

cece o cici I don't actually know how to spell her name

it was Ian but he died but it is jenna o shona

Well the first a from series 1-3 was Mona then segundo on was Sarah as she is red capa (you find this out in the episode that u find out who a is) (Ali was never A) then it was cece who estola the game from Mona but their is now a new a