the fast fast running boy, day 4 - machu picchu

We took the bus down from Machu Picchu. This kid ran after the bus from the top to the bottom, at every corner he yelled to us "GOOD BYE", and at the bottom he came up the bus and asked for tips. He was the P?? (forgot the name) boy. Those people in ancient time were messengers and running fast was their specialty.