#include <bits/stdc++.h>
using namespace std;
int main() {
	string s; cin >> s;
	valarray<int> a = { 0, 0 }, b = { 1, 0 }, c = { 0, 1 }, g = a + b + c;
	set<vector<int>> se;
	se.emplace(begin(g), end(g));
	for(auto e: s) {
		if(e == 'a') { a = b + c - a; }
		if(e == 'b') { b = c + a - b; }
		if(e == 'c') { c = a + b - c; }
		g = a + b + c;
		se.emplace(begin(g), end(g));
	}
	cout << se.size() << endl;
}