The Board of Selectmen is seeking public input on whether a monitor for the state Lottery’s Keno game should be allowed at the Richdale convenience store on Topsfield Road. The board plans to invite public comment at its meeting scheduled for 7 p.m. Tuesday at Town Hall. The state Lottery Commission will consider the board’s response before rendering its decision on whether to install the monitor. The store currently sells Keno to Go tickets, but customers have to go elsewhere to watch the bouncing balls that are part of the game on a computer to see if they won. The new monitor would allow customers to stay in the store to see the outcome.