fn separate_numbers_and_non_numbers(input: &str) -> Vec<String> {
    let mark = "!";
    let s = format!("{}{}", mark, input);
    let mut result = vec![];

    let mut temp_str = String::new();
    let mut prev_char_digit = s.chars().next().map_or(false, |c| c.is_digit(10));
    for c in s.chars().skip(1) {
        let is_digit = c.is_digit(10);
        if prev_char_digit == is_digit {
            temp_str.push(c);
        } else {
            result.push(temp_str.clone());
            temp_str.clear();
            temp_str.push(c);
            prev_char_digit = is_digit;
        }
    }
    result.push(temp_str);
    result
}


fn main() {
    let s = "abc123def456xyz";

    let result = separate_numbers_and_non_numbers(s);
    println!("Result: {:?}", result); // ["abc", "123", "def", "456", "xyz"]
}