#include<bits/stdc++.h>
using namespace std;
int main() {
    string s; cin >> s;
    map<char, pair<int, int>> m;
    m['a'] = {-1, 0};
    m['b'] = {0, -1};
    m['c'] = {0, 1};
    int r = 0, c = 0;
    set<pair<int ,int>> st;
    st.insert({r, c});
    for (int i = 0, sg = -1; i < (int) s.size(); i++, sg = -sg) {
        auto [dr, dc] = m[s[i]];
        r += dr; c += dc;
        st.insert({r, c});
        m[s[i]] = {-dr, -dc};
        if (dr == 0) {
            for (char c = 'a'; c <= 'c'; c++) {
                if (m[c].first) m[c] = {dr, dc};
                else if (c != s[i]) m[c] = {sg, 0};
            }
        }
    }
    cout << st.size() << endl;
}