using System;
using System.Text.RegularExpressions;
public class Kata
{
  public static int DuplicateCount(string str)
  {
    str = str.ToLower();
    str = str.Replace(" ", "");
    int x = 0;
    for (int i = 0; i < str.Length; i++){

      for (int m = 0; m < str.Length; m++){

        if(str[m] == str[i] && m != i){
          x++;
          str = str.Replace(str[i].ToString(), "");
        }

      }

    }
    return x;
  }
}