I agree with the answer, but is there a reason you have to let the cat out?
With all the dogs, feral toms, cars, poisons, weirdos, parasites, and environmental concerns (many songbird populations are going extinct of which domestic cat predation is listed in the top five causes per the government's US Fish and Wildlife Service's division), there are a lot of good reasons to keep kitty inside if at all possible. They have some nice outdoor enclosures, then no worries about running off either.
