
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 start by testing the function on some input strings. 

COMMAND: PYTHON(./temp/function.py "Hello" "World" "test" "123" "example")
user:
Response: Function input - output pairs: (Hello, darrt) (World, ktlrm) (test, uaeu) (123, 123) (example, aoszhra) 

assistant:
Let's test more cases including one or two-character strings and special characters.

COMMAND: PYTHON(./temp/function.py "A" "B" "a" "b" "AB" "ab" "!@#" "12a" "1A")
user:
Response: Function input - output pairs: (A, s) (B, y) (a, s) (b, y) (AB, sy) (ab, sy) (!@#, !@#) (12a, 12s) (1A, 1s) 

assistant:
Based on the input-output pairs we've seen so far, it looks like the function is iterating through each character of the input string and shifting it by a certain amount in the alphabet. The function also leaves numbers and special characters unchanged. Let's test a few more cases to confirm this observation.

COMMAND: PYTHON(./temp/function.py "Shift" "RANGE" "lower" "Upper" "!Mix2")
user:
Response: Function input - output pairs: (Shift, edxju) (RANGE, lsfba) (lower, rtkal) (Upper, nhhal) (!Mix2, !zxo2) 

assistant:
Based on the tests, the function seems to be iterating through the characters in the input string. For uppercase letters, it shifts them by +18 positions in the alphabet, and for lowercase letters, it shifts them by +20 positions. The function leaves numbers and special characters unchanged.

[DESCRIPTION]: Shifts uppercase letters by +18 positions and lowercase letters by +20 positions in the alphabet, while keeping numbers and special characters unchanged.

[CODE]:
```python
def approx_function(s: str) -> str:
    result = ""
    for char in s:
        if char.isupper():
            result += chr(((ord(char) - 65 + 18) % 26) + 65)
        elif char.islower():
            result += chr(((ord(char) - 97 + 20) % 26) + 97)
        else:
            result += char
    return result
```
