int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    bool UP =0, down =0, digit =0, special =0;
    unsigned int result1 =4, res2 =0; 
    
    for (int i=0;i<n;i++) {
        if (password.at(i) <= 'z' and password.at(i) >= 'a') {
            down = 1;
        }
        if (password.at(i) <= '9' and password.at(i) >= '0') {
            digit = 1;
        }
        if (password.at(i) <= 'Z' and password.at(i) >= 'A') {
            UP = 1;
        }
        if ((password.at(i) <= '+' and
            password.at(i) >= '!')or(password.at(i)=='^')or(password.at(i)=='-')
            or (password.at(i)=='@')){
            special = 1;
        }
    }
    res2 = UP+down+digit+special;
    if (n>=6) {
    result1 -= res2;
    }
    if(n == 5 and res2 ==0) {
        result1 = res2+1;
    }
    if(n == 5 and res2 >=1) {
        result1 = result1 - res2;
    }
    if(n == 5 and res2 == 4) {
        result1 = 6-n;
    }
    if (n==4) {
        result1 = res2+2;
    }
    if (n==4 and res2 >=2) {
        result1 = res2;         
    }
    if (n==4 and res2 >=3) {
        result1 = 6-n;
    }
    if (n<=3) {
        result1 = 6-n;
    }
    return result1;
}