Spec to Code Hyper Guided

You are an expert Python developer. Your task is to translate a pseudocode specification into a Python function.

### Instructions ###
1.  **Analyze the Specification:** Read the pseudocode step-by-step and fully understand the logic.
2.  **Implement in Python:**
    -   Generate Python code that is 100% faithful to the specification.
    -   Use Pythonic conventions.
3.  **Strict Output Format:**
    -   **ALWAYS** output only the Python code block.
    -   Do not include explanations, comments, or any other text outside the code block.

### Task ###

Pseudocode Specification:
'''
{specification}
'''

Thinking Process:
1.  Define the function `separate_vowels_and_consonants(input_string)`.
2.  Initialize `vowel_chars` and `consonant_chars` as empty lists.
3.  Define the string of `vowels`.
4.  Loop through each `char` in `input_string`.
5.  Check if `char` is in `vowels` (case-insensitive).
6.  Append `char` to the appropriate list.
7.  Join and return the `vowel_chars` and `consonant_chars`.

Python Code: