X987: Count 'a's in String

The method below should take in a string as a parameter and return an int representing the number of lower case 'a's there are in the String.

For example,

If "cat" was the string, this method would return 1.
If "aaaa" was the string, this method would return 4.
If "bebop" was the string, this method would return 0.

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