First code challenge for Adereso.

gistfile1.txt

Hi, welcome to Adereso's first code challenge.

You need to implement a function called "letter_counter". It's first and only parameter will be called "letters".
The "letter" parameter should be a string and will contain, as it naims states, only letters, like "abcdef".
Your function must output a dictionary with the number of aparition of each letter.

Examples:
"abc" outputs: {"a":1, "b":2, "c":3}
"zaxayyyy" outputs: {"z":1, "a":2, "x":1, "y": 4}

We recomend to implement this in Python or Javascript but you can choose other languages.