    #include <iostream>
    int main()
    {
      char a;
      char buf[10000];
      int k = 0;
      for (int p = 0; 1; p++) {
      	std::iostream::cin >> a;
        if (buf[p] != a) {
          	buf[p] = a;
            k++;
        	break;
        }
      }
      std::iostream::cout << k;
    }