Problem 3019. Calculator spelling - Letters to Numbers

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:

• 0 = O
• 1 = I
• 2 = Z
• 3 = E
• 4 = h
• 5 = S
• 6 = g
• 7 = L
• 8 = B

There are a few other options, but we'll stick with these. If the word has a trailing O, the number will need a decimal point to produce a leading zero. Write a function that takes a word (upside down) as input and returns the number entered into the calculator.

This problem is related to Problem 3018.