
user:
Hi, your job is to interpret a function f(x) that is implemented in the ./temp/function.py script. f(x) takes string inputs.
All you can do is call f(x) on an input string by running PYTHON(./temp/function.py string). 
Try to describe the function implemented by f(x) by running experiments on it. 
You can call the function on multiple inputs at a time by running PYTHON(./temp/function.py string1 string2 string3 ...). 
We encourage testing a large range of inputs before writing a description.
The goal is to find a good simple description of f(x) that explains most of the function behavior. f(x) may combine multiple different operations.
Your description of the function should be in the following form.
[DESCRIPTION]: Describe what the function is doing in language. 
[CODE]: Write python code that approximates the behavior of the function. 
assistant:
Sounds interesting! Let's start by testing the function with some initial inputs.

COMMAND: PYTHON(./temp/function.py "hello" "world" "example" "123")
user:
Response: Function input - output pairs: (hello, holle) (world, world) (example, example) (123, 123) 

assistant:
Interesting. Let's try more inputs with different characters and lengths.

COMMAND: PYTHON(./temp/function.py "abcd" "test" "qwerty" "function" "ABCDEFGHI" "spaces between" "&*$tringWith$" "!@#")
user:
Response: Function input - output pairs: (abcd, abcd) (test, test) (qwerty, qwerty) (function, fonctiun) (ABCDEFGHI, IBCDEFGHA) (spaces between, speces betwean) (&*$, &*$) (!@#, !@#) 

assistant:
Based on the responses so far, it appears that the function exchanges the first and last characters of a string if they are alphabets. Let's test this hypothesis with more examples. 

COMMAND: PYTHON(./temp/function.py "banana" "orange" "apple" "grape" "melon")
user:
Response: Function input - output pairs: (banana, banana) (orange, erango) (apple, eppla) (grape, grepa) (melon, molen) 

assistant:
From the results of these tests, it is clear that the function exchanges the first and last characters of a string if they are alphabets.

[DESCRIPTION]: The function exchanges the first and last characters of a string if they are alphabets.

[CODE]: 
```python
def custom_function(s):
    if s[0].isalpha() and s[-1].isalpha():
        return s[-1] + s[1:-1] + s[0]
    else:
        return s
```