<s>[INST] def find_characters(s, chrs):
    """
    This function finds the indices of all occurrences of a list of characters in a given string.

    Args:
        s (str): The string to search in.
        chrs (list): A list of characters to search for.

    Returns:
        dict: A dictionary where the keys are the characters and the values are lists of their indices in the string.
    """[/INST]