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// {{{
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define FOR(i, b, e) for (int i = (b); i <= (e); i++)
#define FORD(i, b, e) for (int i = (e); i >= (b); i--)
#define MP make_pair
#define FS first
#define ND second
#define PB push_back
#define ALL(x) x.begin(), x.end()

using namespace std;

using LL = long long;
using LD = long double;
using PII = pair<int,int>;
using PLL = pair<LL,LL>;
using PLD = pair<LD,LD>;
using VI = vector<int>;
using VLL = vector<LL>;
using VLD = vector<LD>;
using VB = vector<bool>;
using VS = vector<string>;
template<class T>
using V = vector<T>;
template<class T1, class T2>
using P = pair<T1,T2>;
template<class T,class Comp=greater<T>>
using PQ = priority_queue<T,V<T>,Comp>;

template<class T>
int sz(const T& a) { return (int)a.size(); }
template<class T>
void amin(T& a, T b) { a = min(a, b); }
template<class T>
void amax(T& a, T b) { a = max(a, b); }

/*
const size_t rseed =
  std::chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rnd(rseed);
template<class T> T randint(T lo, T hi)
{
  return uniform_int_distribution<T>{lo,hi}(rnd);
}
*/

/* find_by_order(k) - k'th largest counting from 0;
   order_of_key(k) - number of items strictly smaller than k;
   join(other), split(k, other) - all keys in other greater than in *(this). */
template<class K,class V,class Comp=less<K>>
using ordered_map = __gnu_pbds::tree<K,V,Comp,
      __gnu_pbds::rb_tree_tag,__gnu_pbds::tree_order_statistics_node_update>;
template<class T,class Comp=less<T>>
using ordered_set = ordered_map<T,__gnu_pbds::null_type,Comp>;

const int inf = 1e9 + 1;
const LL infl = 1e18 + 1;

void solve();
// }}}

int main()
{
  int t = 1;
  // scanf("%d", &t);
  FOR(i, 1, t) {
    // printf("Case #%d: ", i);
    solve();
  }
}

const int N = 3e5;
char s[N + 2];
map<PII,int> M;
int n, x, y;
LL ans;

void solve()
{
  scanf("%s", &s[1]);
  n = strlen(&s[1]);

  // a = b = c
  FOR(i, 1, n) {
    M[MP(-x, -y)]++;
    switch (s[i]) {
      case 'a':
        x++;
        break;
      case 'b':
        x--;
        y++;
        break;
      case 'c':
        y--;
        break;
    }
    ans += M[MP(-x, -y)];
  }

  for (const char* c : {"ab", "bc", "ca"}) {
    x = 0;
    M.clear();
    FOR(i, 1, n) {
      M[MP(-x, 0)]++;
      if (s[i] == c[0]) {
        x++;
      }
      else if (s[i] == c[1]) {
        x--;
      }
      else {
        x = 0;
        M.clear();
      }
      ans += M[MP(-x, 0)];
    }
  }

  for (char c : "abc") {
    int k = 0;
    FOR(i, 1, n) {
      if (s[i] != c) {
        k = 0;
      }
      else {
        k++;
      }
      ans += k;
    }
  }

  printf("%lld\n", ans);
}