CodingBat ferrer@hendrix.edu a_to

Write a function that counts the number of times the letters 'a', 'b', 'c', 'd', and 'e' appear in a string.

a_to_e('hello') → 1
a_to_e('goodbye') → 3
a_to_e('iconic') → 2

...Save, Compile, Run (ctrl-enter)

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