Kata

Gigi is a clever monkey, living in the zoo, his teacher (animal keeper) recently taught him some knowledge of "0".

In Gigi's eyes, "0" is a character contains some circle (maybe one, maybe two).

So, a is a "0",b is a "0",6 is also a "0"，and 8 have two "0" ,etc...

Now, write some code to count how many "0"s in the text.

Let us see who is smarter? You ? or monkey?

Input always be a string (including words numbers and symbols)，You don't need to verify it, but pay attention to the difference between uppercase and lowercase letters.

Here is a table of characters：

Output will be a number of "0".