Write a function that takes a string and prints out the letters in the string in reverse order.
Note: Similar to the previous question, an answer can assume that the string passed in is a letter, but a more accurate answer is one that checks if each index of a string is a letter as the below does.
```
def reverseLetters(source):
for index in range(len(source)-1, -1, -1):
if source[index].isalpha():
print source[index]
```
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