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public static string CheckPasswordStrength(string password)
{
    int length = password.Length;
    int complexity = password.Distinct().Count();
    bool hasUppercase = false;
    bool hasLowercase = false;
    bool hasDigit = false;
    bool hasSpecialChar = false;

    // Check if the password meets the criteria for weak password
    if (length < 8 || complexity < 4 || (!password.Any(char.IsUpper) || !password.Any(char.IsLower) || !password.Any(char.IsDigit)))
    {
        return "Weak";
    }

    // Check if the password meets the criteria for fair password
    if (length < 12 || complexity < 6 || (!password.Any(char.IsUpper) || !password.Any(char.IsLower) || !password.Any(char.IsDigit) || !password.Any(ch => !char.IsLetterOrDigit(ch))))
    {
        return "Fair";
    }

    // Check if the password meets the criteria for good password
    if (length < 16 || complexity < 8 || (!password.Any(char.IsUpper) || !password.Any(char.IsLower) || !password.Any(char.IsDigit) || !password.Any(ch => !char.IsLetterOrDigit(ch))))
    {
        return "Good";
    }

    // If the password does not meet the criteria for any of the above categories, it is classified as strong
    return "Strong";
}