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#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < n; i++)
#define pb push_back
#define debug(x) cout << #x << " " << x << endl
#define all(x) x.begin(),x.end()
#define ll long long
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vll vector<ll>
#define vvll vector<vll>
#define ld long double
#define ull unsigned long long
#define vull vector<ull>
#define fi first
#define se second
#define PII pair<int,int>
#define vPII vector<PII>
#define getunique(v) {sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end());}
#define int128 __int128

map<PII,int> a,b,c,ab,ac,bc,abc;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << setprecision(12) << fixed;
//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);
    int tt = 1;
//    cin >> tt;
    while(tt--) {
        string s; cin >> s;
        int n = s.size();
        a[{0,0}]++;
        b[{0,0}]++;
        c[{0,0}]++;
        ab[{0,0}]++;
        ac[{0,0}]++;
        bc[{0,0}]++;
        abc[{0,0}]++;
        int cnta = 0, cntb = 0, cntc = 0;
        ll ans = 0;
        rep(i,n){
            if(s[i] == 'a'){
                cnta++;
                ans += a[{cntb,cntc}];
            }
            else if(s[i] == 'b'){
                cntb++;
                ans += b[{cnta,cntc}];
            }
            else{
                cntc++;
                ans += c[{cnta,cntb}];
            }
            if(s[i] != 'a'){
                ans += bc[{cnta, cntb-cntc}];
            }
            if(s[i] != 'b'){
                ans += ac[{cntb, cnta-cntc}];
            }
            if(s[i] != 'c'){
                ans += ab[{cntc, cnta-cntb}];
            }
            ans += abc[{cnta-cntb, cnta-cntc}];
            a[{cntb, cntc}]++;
            b[{cnta,cntc}]++;
            c[{cnta,cntb}]++;
            ab[{cntc,cnta-cntb}]++;
            bc[{cnta, cntb-cntc}]++;
            ac[{cntb, cnta-cntc}]++;
            abc[{cnta-cntb, cnta-cntc}]++;
        }
        cout << ans;
    }
}