using System.Text.RegularExpressions;
public class Program
{
    static void Main()
    {
        string s = "12345678901234567890123456789012";
        var match = s.Length >=1 && s.Length <=100
                && Regex.Match(s, "^[a-zA-Z0-9_-]{1,31}$").Success
                && !Regex.Match(s, "^[-_]").Success
                && !Regex.Match(s, "[-_]$").Success;

        Console.WriteLine(match ? 200 : 400);
    }
}