fn pickingNumbers(a: &[i32]) -> i32 {
    let mut a_sorted: Vec<i32> = a.to_vec();
    a_sorted.sort_unstable();

    let mut max_counter = 0;
    let mut counter = 0;
    let mut checked = a_sorted[0];
    
    for num in a_sorted {
        if (checked - num).abs() > 1 {
            checked = num;
            counter = 1;
        } else {
            counter += 1;
        }
        max_counter = max_counter.max(counter);
    }
    max_counter
}