Roberto wants to clean up his neighborhood by picking up trash. The total distance around his block is 134 of a mile. He decides to do this over a two-day period. If he walks 58 of a mile on the first day, how far does he need to walk the second day to pick up trash?

Roberto needs to walk 1 - 134= <<1-134=-133>>-133 mile on the second day. Answer: \boxed{-133}.