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#include <cstring>
#include <cstdio>
#include <map>

const int max_n = 400000;
char input[max_n];
int n;
std::map<long long, int> bilans;

int main() {
  scanf("%s", &input);
  n = strlen(input);
  long long count = 0, curr = 0;
  bilans[0] = 1;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'a') curr -= max_n + 1;
    if (input[i] == 'b') curr += 1;
    if (input[i] == 'c') curr += max_n;
    count += bilans[curr];
    ++bilans[curr];
  }

  bilans.clear();
  bilans[0] = 1;
  curr = 0;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'a') curr -= 1;
    if (input[i] == 'b') curr += 1;
    if (input[i] == 'c') curr += max_n;
    count += bilans[curr];
    ++bilans[curr];
  }

  bilans.clear();
  bilans[0] = 1;
  curr = 0;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'a') curr -= 1;
    if (input[i] == 'c') curr += 1;
    if (input[i] == 'b') curr += max_n;
    count += bilans[curr];
    ++bilans[curr];
  }

  bilans.clear();
  bilans[0] = 1;
  curr = 0;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'c') curr -= 1;
    if (input[i] == 'b') curr += 1;
    if (input[i] == 'a') curr += max_n;
    count += bilans[curr];
    ++bilans[curr];
  }

  bilans.clear();
  bilans[0] = 1;
  curr = 0;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'c') curr += 1;
    if (input[i] == 'a') curr += 1;
    count += bilans[curr];
    ++bilans[curr];
  }

  bilans.clear();
  bilans[0] = 1;
  curr = 0;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'a') curr += 1;
    if (input[i] == 'b') curr += 1;
    count += bilans[curr];
    ++bilans[curr];
  }

  bilans.clear();
  bilans[0] = 1;
  curr = 0;
  for (int i = 0; i < n; ++i) {
    if (input[i] == 'c') curr += 1;
    if (input[i] == 'b') curr += 1;
    count += bilans[curr];
    ++bilans[curr];
  }

  printf("%lld\n", count);
  return 0;
}