How do you get the coin in mythology island on poptropica?

go to the far right until you see this ugly place. Go down their and click on the guy he says if you clean the handwriting he pay you one drachma. click on the hand writing and gao zig zag until you cant see it anymare. THERE ARE THREE HAND WRITIGS AFTER YOU erase all ofm them you click on the guy. he will then give you the coin