/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.11.20 21:54:03
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    string s;cin >> s;
    int n = s.size();
    set<pair<int,int>> st;
    int ans = 0;
    int now_x = 200000, now_y = 200000;
    st.insert({now_x,now_y});
    for (int i = 0; i < n; i++) {
        if (now_x % 2 == 0 && now_y % 3 == 0) {
            if (s[i] == 'a') {
                now_y++;
            }
            else if (s[i] == 'b') {
                now_x--;
            }
            else {
                now_y--;
            }
        }
        else if (now_x % 2 == 0 && now_y % 3 == 1) {
            if (s[i] == 'a') {
                now_y--;
            }
            else if (s[i] == 'b') {
                now_y++;
            }
            else {
                now_x++;
            }
        }
        else if (now_x % 2 == 0 && now_y % 3 == 2) {
            if (s[i] == 'a') {
                now_x--;
            }
            else if (s[i] == 'b') {
                now_y--;
            }
            else {
                now_y++;
            }
        }
        else if (now_x % 2 == 1 && now_y % 3 == 0) {
            if (s[i] == 'a') {
                now_y++;
            }
            else if (s[i] == 'b') {
                now_x++;
            }
            else {
                now_y--;
            }
        }
        else if (now_x % 2 == 1 && now_y % 3 == 1) {
            if (s[i] == 'a') {
                now_y--;
            }
            else if (s[i] == 'b') {
                now_y++;
            }
            else {
                now_x--;
            }
        }
        else if (now_x % 2 == 1 && now_y % 3 == 2) {
            if (s[i] == 'a') {
                now_x++;
            }
            else if (s[i] == 'b') {
                now_y--;
            }
            else {
                now_y++;
            }
        }
        st.insert({now_x,now_y});
    }
    cout << st.size() << endl;
    return 0;
}