const SPECIAL_CHARS: &'static str = "!@#$%^&*()-+";
fn minimumNumber(n: i32, password: &str) -> i32 {
    // Return the minimum number of characters to make the password strong
    let missing_char = if n < 6 { 6 - n } else { 0 };
    let mut criteria = [0; 4];
    
    for c in password.chars() {
        if SPECIAL_CHARS.contains(c) {
            criteria[0] += 1;
        } else if c.is_digit(10) {
            criteria[1] += 1;
        } else if c.is_lowercase() {
            criteria[2] += 1;
        } else if c.is_uppercase() { 
            criteria[3] += 1; 
        }
    }
    
    let missing_criteria = criteria.iter().map(|&x| if x > 0 { 0 } else { 1 }).sum::<i32>();
    if missing_char >= missing_criteria { missing_char } else { missing_criteria }     
}