First we are looking for the flag of an African country where Charlie is staying. The poem will give you clues…
The flag is not green, red or yellow. It also has no moons or stars. Blue seems to be the main colour of the flag.
We are looking for the flag of Botswana. If you look on the Internet you will see that the national animal of Botwana is the zebra. Maybe that will help you with the next letter.