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#include <bits/stdc++.h>
#include <chrono>
#include <ext/pb_ds/assoc_container.hpp>
#include <math.h>
using namespace __gnu_pbds;
using namespace std;
#define endl "\n"
#define mp make_pair
#define st first
#define nd second
#define pii pair<int, int>
#define pb push_back
#define _upgrade ios_base::sync_with_stdio(0), cout.setf(ios::fixed), cout.precision(10), cin.tie(0), cout.tie(0);
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define fwd(i, a, b) for (int i = (a); i < (b); ++i)
#define trav(a, x) for (auto &a : x)
#define all(c) (c).begin(), (c).end()
#define sz(X) (int)((X).size())
typedef long double ld;
typedef unsigned long long ull;
typedef long long ll;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set; // find_by_order(x) <-returns x-th element   order_of_key(x) <- returns order of element x
// mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());uniform_int_distribution<int> distr(0, 1e9);auto my_rand = bind(distr, gen); // my_rand() zwraca teraz liczbe z przedzialu [a, b]
#ifdef LOCAL
ostream &operator<<(ostream &out, string str) {
   for (char c : str)
      out << c;
   return out;
}
template <class L, class R> ostream &operator<<(ostream &out, pair<L, R> p) { return out << "(" << p.st << ", " << p.nd << ")"; }
template <class L, class R, class S> ostream &operator<<(ostream &out, tuple<L, R, S> p) {
   auto &[a, b, c] = p;
   return out << "(" << a << ", " << b << ", " << c << ")";
}
template <class T> auto operator<<(ostream &out, T a) -> decltype(a.begin(), out) {
   out << '{';
   for (auto it = a.begin(); it != a.end(); it = next(it))
      out << (it != a.begin() ? ", " : "") << *it;
   return out << '}';
}
void dump() { cerr << "\n"; }
template <class T, class... Ts> void dump(T a, Ts... x) {
   cerr << a << ", ";
   dump(x...);
}
#define debug(...) cerr << "[" #__VA_ARGS__ "]: ", dump(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define int long long

int get(string S, char t) {
   int res = 0;
   int cur = 0;
   for (char c : S)
      if (c == t)
         res += ++cur;
      else
         cur = 0;
   debug(S, t, res);

   return res;
}

int get(string S, char t1, char t2) {
   map<int, int> M = {{0, 1}};
   int cur = 0;
   int res = 0;
   for (char c : S) {
      if (c == t1)
         cur++;
      if (c == t2)
         cur--;
      if (c != t1 && c != t2) {
         M = {{0, 1}};
         cur = 0;
      } else {
         res += M[cur]++;
      }
      debug(M);
   }
   debug(S, t1, t2, res);
   return res;
}

int get(string S) {
   map<pii, int> M;

   M[{0, 0}] = 1;
   int res = 0;
   pii cur = {0, 0};

   for (char c : S) {
      if (c == 'a')
         cur.st++, cur.nd++;
      if (c == 'b')
         cur.st--;
      if (c == 'c')
         cur.nd--;
      res += M[cur]++;
   }
   debug(S, res);
   return res;
}

int32_t main() {
   _upgrade;
   string S;
   cin >> S;
   int res = get(S) + get(S, 'a') + get(S, 'b') + get(S, 'c') + get(S, 'a', 'b') + get(S, 'a', 'c') + get(S, 'b', 'c');

   cout << res << endl;
}