Using the numbers on a calculator, and rotating the display 180 degrees, many words can be spelled. In particular, the following numbers can characterize the following letters:
There are a few other options, but we'll stick with these. The number may be a have a decimal with a leading zero, to produce a trailing O. If this is the case, ignore the decimal point. Write a function that takes a number as input and returns the word spelled (upside down) by the calculator. Make sure to get the case (capital vs. lowercase) right for each number/letter.
This problem is related to Problem 3019.