#include <bits/stdc++.h>
using namespace std;
using P = array<int, 2>;
using T = array<P, 3>;
P operator+(P a, P b) { return { a[0] + b[0], a[1] + b[1] }; }
P operator-(P a, P b) { return { a[0] - b[0], a[1] - b[1] }; }
int main() {
	string s; cin >> s;
	P a = { 0, 0 }, b = { 1, 0 }, c = { 0, 1 };
	set<T> se = { { a, b, c } };
	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; }
		se.insert({ a, b, c });
	}
	cout << se.size() << endl;
}