using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(validarRut("9.107.700-1")); 

    }

    public static bool validarRut(string rut ) {

     bool validacion = false;

     try {

        rut =  rut.ToUpper();

        rut = rut.Replace(".", "");

        rut = rut.Replace("-", "");

        int rutAux = int.Parse(rut.Substring(0, rut.Length - 1));

        char dv = char.Parse(rut.Substring(rut.Length - 1, 1));

        int m = 0, s = 1;

        for (; rutAux != 0; rutAux /= 10) {

           s = (s + rutAux % 10 * (9 - m++ % 6)) % 11;

        }

        if (dv == (char) (s != 0 ? s + 47 : 75)) {

           validacion = true;

        }

     } catch (Exception) {

     }

     return validacion;

  }

}