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#include <iostream>

bool checkWord(std::string word) {
  unsigned int counterA = 0, counterB = 0, counterC = 0;
  for(char letter: word) {
    switch(letter) {
      case 'a':
        counterA++;
        break;
      case 'b':
        counterB++;
        break;
      case 'c':
        counterC++;
        break;
    }
  }
  if(counterA == 0) {
    if(counterB == 0) {
      return true;
    }

    if(counterC == 0) {
      return true;
    }

    return counterB == counterC;
  }

  if(counterB == 0) {
    if(counterC == 0) {
      return true;
    }

    return counterC == counterA;
  }

  if(counterC == 0) {
    return counterB == counterA;
  }

  return counterA == counterB == counterC;
}

int main() {
  std::string word;
  std::string resultWord;
  unsigned int result = 0;
  std::cin >> word;
  for(int idxStart = 0; idxStart < word.length(); idxStart++) {
    resultWord = "";
    for(int idxCurrent = idxStart; idxCurrent < word.length(); idxCurrent++) {
      resultWord += word[idxCurrent];
      if(checkWord(resultWord)) {
        result++;
      }
    }
  }
  std::cout << result;
}