Automatic identity recognition from text outputs

Johnny, Winnie, Manny, and Cathy use their one-dimensional keyboard (as described in the handout) to type the Biola vision statement and because of typos in the process we have a collection of 8 text files A, B, C, D, E, F, G and H. Each of the eight documents was typed by one of Johnny, Winnie, Manny, and Cathy. You task is to determine for each document d who is the most likely person who has generated the document d when trying to type the Biola vision statement. Who do you think generate each of these 8 documents?