
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:
Alright, let's run some initial tests to understand the function's behavior.

COMMAND: PYTHON(./temp/function.py "hello" "world" "test" "123" "abc" "")
user:
Response: Function input - output pairs: (hello, helloWF) (world, worldWF) (test, testWF) (123, 123WF) (abc, abcWF) (, WF) 

assistant:
From the initial test, it seems the function appends 'WF' to the input string. Let's further test the function for edge cases and different types of input strings, including special characters and alphanumeric combinations.

COMMAND: PYTHON(./temp/function.py "@!&" "abcd1234" "W8_1$" "edgecase" "20.20" "#%*()")
user:
Response: Function input - output pairs: (@!&, @!&WF) (abcd1234, abcd1234WF) (W8_1$, W8_1$WF) (edgecase, edgecaseWF) (20.20, 20.20WF) (#%*(), #%*()WF) 

assistant:
Based on the test results, the function appends 'WF' to the input string for various types of input strings, including special characters and alphanumeric combinations. Here's the description and the Python code for the function:

[DESCRIPTION]: The function appends "WF" to the input string.

[CODE]:
```python
def f(x):
    return x + "WF"
```