#include <iostream>

using namespace std;
int main()
{
  string chuj;
  int count[26] = {0};
  int numb = 0;
  int i;
  cin >> chuj;
  for (i = 0;i < chuj.length();i++)
  {
    if (chuj[i]==chuj[i+1])
    {
        count[i]++;
    }
  }
  for (i = 0;i < 26;i++)
  {
    if (count[i] != 0)
    {
      numb++;
    }
  }
  cout<<"The ammount of repeating letters is\t" << numb << endl;

  system("pause");
  return 0;
}