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#include <cstdio>
#include <cstring>
#include <cmath>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <iterator>
#include <string>
#include <vector>
#include <queue>
#include <bitset>
#include <utility>
#include <stack>
#include <unordered_map>

#include <functional>

namespace hash_tuple {
template <typename TT> struct hash {
    size_t operator()(TT const &tt) const { return std::hash<TT>()(tt); }
};

// from boost (functional/hash):
// see http://www.boost.org/doc/libs/1_35_0/doc/html/hash/combine.html template
template <class T> inline void hash_combine(std::size_t &seed, T const &v) {
    seed ^= hash_tuple::hash<T>()(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}

// Recursive template code derived from Matthieu M.
template <class Tuple, size_t Index = std::tuple_size<Tuple>::value - 1>
struct HashValueImpl {
    void operator()(size_t &seed, Tuple const &tuple) const {
        HashValueImpl<Tuple, Index - 1>{}(seed, tuple);
        hash_combine(seed, std::get<Index>(tuple));
    }
};
template <class Tuple> struct HashValueImpl<Tuple, 0> {
    void operator()(size_t &seed, Tuple const &tuple) const {
        hash_combine(seed, std::get<0>(tuple));
    }
};

template <typename... TT> struct hash<std::tuple<TT...>> {
    size_t operator()(std::tuple<TT...> const &tt) const {
        size_t seed = 0;
        HashValueImpl<std::tuple<TT...>>{}(seed, tt);
        return seed;
    }
};
// auxiliary generic functions to create a hash value using a seed
template <typename T> inline void hash_val(std::size_t &seed, const T &val) {
    hash_combine(seed, val);
}

template <typename T, typename... Types>
inline void hash_val(std::size_t &seed, const T &val, const Types &... args) {
    hash_combine(seed, val);
    hash_val(seed, args...);
}

template <typename... Types>
inline std::size_t hash_val(const Types &... args) {
    std::size_t seed = 0;
    hash_val(seed, args...);
    return seed;
}

struct pair_hash {
    template <class T1, class T2>
    std::size_t operator()(const std::pair<T1, T2> &p) const {
        return hash_val(p.first, p.second);
    }
};
} // namespace hash_tuple


using namespace std;
typedef long long LL;
typedef pair<int,int> PII;
typedef vector<int> VI;
#define MP make_pair
#define FOR(v,p,k) for(int v=(p);v<=(k);++v)
#define FORD(v,p,k) for(int v=(p);v>=(k);--v)
#define REP(i,n) for(int i=0;i<(n);++i)
#define VAR(v,i) __typeof(i) v=(i)
#define FOREACH(i,c) for(VAR(i,(c).begin());i!=(c).end();++i)
#define PB push_back
#define ST first
#define ND second
#define SIZE(x) (int)x.size()
#define ALL(c) c.begin(),c.end()

#define ODD(x) ((x)%2)
#define EVEN(x) (!(ODD(x)))

char t[300009];

int main() {
	scanf("%s\n", t);

	LL res=0;
        int n = strlen(t);
        VI curr(3);

        vector<unordered_map<PII, int, hash_tuple::pair_hash>> maps(1+3+3);
        FOREACH(i, maps) {
            (*i)[MP(0,0)]++;
        }
        REP(i, n) {
            curr[t[i]-'a']++;

            vector<PII> keys = {
                MP(curr[1] - curr[0], curr[2]-curr[0]),
                MP(curr[1] - curr[0], curr[2]),
                MP(curr[2] - curr[0], curr[1]),
                MP(curr[2] - curr[1], curr[0]),
                MP(curr[0], curr[1]),
                MP(curr[0], curr[2]),
                MP(curr[1], curr[2]),
            };
            REP(i, 7) {
                auto &key = keys[i];
                auto &m = maps[i];
                res += m[key];
                m[key]++;
            }
        }

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