A posting we will go

I needed to send some correspondence this afternoon, so when the Podlings had woken up from their naps, I told Tom we were going to the Post Office to post some letters. He got very excited, but I thought that perhaps it was just that we don't usually run errands in the afternoon, so he was just excited to be going out. As I was strapping him into the pushchair, it became apparent why he was so looking forward to the trip. "Post yetters!" he said excitedly, "Post yetters A and B and C and D!".