ooo i wanna know two
(๑•ㅂ•)و✧
Okay we are not being productive here so how about this I'll ask some some questions to see if we can find it. Was the teenager the police was investigating a girl or a boy? What genre? Under what tags could it be? Comedy? Is there anything else you can remember so I can look for the title? Anything counts!!
Uhh...surprised you don't know, considering that you amazingly remembered the name of the power, which is also the name of the manga. A to Z. http://www.mangago.zone/read-manga/a_to_z/
There is policeman or a detective that has to investigate on a teenager, so he go in the same school, in the same class. That policeman have the ability to copy everything he se, for example when he was taking some notes from the teachers, he copy exactly the same handwriting.
This policeman have a strange power named a-z, i wonder...