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#pragma GCC optimize("O3,unroll-loops")
/* #pragma GCC optimize("Ofast,unroll-loops") */
#pragma GCC target("avx2,popcnt,fma")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pb push_back
#define mp make_pair
#define all(a) begin(a),end(a)
#define FOR(x,val,to) for(int x=(val);x<int((to));++x)
#define FORE(x,val,to) for(auto x=(val);x<=(to);++x)
#define FORR(x,arr) for(auto &x: arr)
#define FORS(x,plus,arr) for(auto x = begin(arr)+(plus); x != end(arr); ++x)
#define FORREV(x,plus,arr) for(auto x = (arr).rbegin()+(plus); x !=(arr).rend(); ++x)
#define REE(s_) {cout<<s_<<'\n';exit(0);}
#define GET(arr) for(auto &i: (arr)) sc(i)
#define whatis(x) cerr << #x << " is " << (x) << endl;
#define debug(x...) cerr << "[" #x "]: ", [](auto... $) {((cerr << $ << "; "), ...); }(x), cerr << '\n'
#define e1 first
#define e2 second
#define INF 0x7f7f7f7f
typedef std::pair<int,int> pi;
typedef std::vector<int> vi;
typedef std::vector<std::string> vs;
typedef int64_t ll;
typedef uint64_t ull;
#define umap unordered_map
#define uset unordered_set
using namespace std;
using namespace __gnu_pbds;
 
#ifdef ONLINE_JUDGE
#define whatis(x) ;
#define debug(x...) ;
#endif
#ifdef _WIN32
#define getchar_unlocked() _getchar_nolock()
#define _CRT_DISABLE_PERFCRIT_LOCKS
#endif
template<class A, class B> auto& operator<<(ostream &o, pair<A, B> p) { return o << '(' << p.first << ", " << p.second << ')'; }
template<class T, enable_if_t<!is_same<T, string>::value, bool> = true> auto operator<<(ostream &o, T x) -> decltype(x.end(), o) { o << '{'; int i = 0; for(auto e : x) o << (", ")+2*!i++ << e; return o << '}'; }
inline void getch(char &x){while(x = getchar_unlocked(), x < 33){;}}
inline void getstr(string &str){str.clear(); char cur;while(cur=getchar_unlocked(),cur<33){;}while(cur>32){str+=cur;cur=getchar_unlocked();}}
template<typename T> inline bool sc(T &num){ bool neg=0; int c; num=0; while(c=getchar_unlocked(),c<33){if(c == EOF) return false;} if(c=='-'){ neg=1; c=getchar_unlocked(); } for(;c>47;c=getchar_unlocked()) num=num*10+c-48; if(neg) num*=-1; return true;}template<typename T, typename ...Args> inline void sc(T &num, Args &...args){ bool neg=0; int c; num=0; while(c=getchar_unlocked(),c<33){;} if(c=='-'){ neg=1; c=getchar_unlocked(); } for(;c>47;c=getchar_unlocked()) num=num*10+c-48; if(neg) num*=-1; sc(args...); }
template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; //s.find_by_order(), s.order_of_key() <- works like lower_bound
template<typename T> using ordered_map = tree<T, int, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define N 1000001
 
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    string s;
    getstr(s);
    map<pair<int,int>, int> mp;
    ++mp[{0,0}];
    /* map<int, int> mpab; */
    /* map<int, int> mpbc; */
    /* map<int, int> mpac; */
    ll res{};
    pair<int,int> cr{};
    /* static int crab, crbc, crac; */
    /* ++mp[{0,0}]; */
    /* ++mpab[0]; */
    /* ++mpbc[0]; */
    /* ++mpac[0]; */
    /* map<int,int> mp2; */
    /* pair<char,char> wh2 = {-1,-1}; */
    /* int lspos[128]; */
    /* lspos['a'] = lspos['b'] = lspos['c'] = -1; */
    static int it;
    FORR(i,s){
        if(i == 'a')
            ++cr.e1;
        else if(i == 'b')
            --cr.e1, ++cr.e2;
        else
            --cr.e2;
        /* lspos[i] = it++; */
        /* if(jj */
        /* if(i == 'a') */
        /*     ++cr.e1, ++crab, ++crac; */
        /* else if(i == 'b') */
        /*     --cr.e1, ++cr.e2, --crab, ++crbc; */
        /* else */
        /*     --cr.e2, --crac, --crbc; */
        res += mp[cr]++;
        /* res -= 3 * mp[cr]++; */
        /* res += mpab[crab]++; */
        /* res += mpac[crac]++; */
        /* res += mpbc[crbc]++; */
    }
    /* debug(res); */
    map<int,int> mp2;
    static int cr2;
    FOR(i,0,s.size()){
        /* debug(i); */
        /* debug(res); */
        /* int it = i; */
        int it = i - 1;
        mp2.clear();
        ++mp2[0];
        cr2 ^= cr2;
        while(it + 1 < s.size() && s[it + 1] == s[i])
            ++it, ++mp2[++cr2];
        int sth = it;
        int mxsi = sth, mxsi2 = sth + 1;
        /* while(it + 1 < s.size() && s[it + 1] == s[sth + 1] || s[it + 1] == s[i]){ */
        /* debug(it, s[it + 1], s[i], s[sth + 1]); */
        while(it + 1 < s.size() && (s[it + 1] == s[sth + 1] || s[it + 1] == s[i])){
            ++it;
            if(s[it] == s[i])
                ++cr2, mxsi = it;
            else
                --cr2, mxsi2 = it;
            /* debug(cr2, mp2[cr2]); */
            res += mp2[cr2]++;
        }
        /* debug(mxsi, mxsi2); */
        /* debug(res); */
        /* debug(s[i], s[mxsi]); */
        /* i = mxsi; */
        i = min(mxsi, mxsi2);
    }
    /* debug(res); */
    FOR(i,0,s.size()){
        int it = i;
        while(it + 1 < s.size() && s[it + 1] == s[i])
            ++it, ++mp2[++cr2];
        res += 1ll*(it - i + 2)*(it - i + 1) >> 1;
        i = it;
    }
    cout << res << '\n';
}