#include <iostream>
#include <string>
#include <vector>

int main() {
  std::string str;
  getline(std::cin, str);
  size_t len = str.length();
  
  std::vector<size_t> num_of_as(len + 1, 0);
  std::vector<size_t> num_of_bs(len + 1, 0);
  std::vector<size_t> num_of_cs(len + 1, 0);
  
  for (size_t i = 0; i < len; ++i) {
    num_of_as[i + 1] = num_of_as[i];
    num_of_bs[i + 1] = num_of_bs[i];
    num_of_cs[i + 1] = num_of_cs[i];
    
    switch(str[i]) {
        case 'a':
        ++num_of_as[i + 1];
        break;
        case 'b':
        ++num_of_bs[i + 1];
        break;
        case 'c':
        ++num_of_cs[i + 1];
        break;
    }
  }
  
  size_t result = 0;
  
  for (size_t i = 0; i < len; ++i) {
      for (size_t j = i; j < len; ++j) {
        const size_t nas = num_of_as[j + 1] - num_of_as[i];
        const size_t nbs = num_of_bs[j + 1] - num_of_bs[i];
        const size_t ncs = num_of_cs[j + 1] - num_of_cs[i];
        if ((nas == 0 && nbs == 0) || 
            (nas == 0 && ncs == 0) || 
            (nbs == 0 && ncs == 0) || 
            (nas == 0 && nbs == ncs) || 
            (nbs == 0 && nas == ncs) || 
            (ncs == 0 && nas == nbs) || 
            ((nas == nbs) && (nbs == ncs))) {
                ++result;
            }
      }
  }


  std::cout << result;
}