#include <bits/stdc++.h>
using namespace std;

int main() {
	string s;
	cin >> s;

	char vertical_side = 'c';
	char right_side = 'b';
	char left_side = 'a';
	bool is_up = true;

	int x = 0,y = 0;
	map<pair<int,int>,bool> mp;
	mp[make_pair(x,y)] = true;
	for(int i = 0;i < s.size();i++){
		if(s[i] == vertical_side){
			if(is_up){
				y--;
			}
			else{
				y++;
			}
			is_up = !is_up;
		}
		else{
			if(s[i] == right_side){
				x++;
				swap(right_side,left_side);
				swap(vertical_side,right_side);
			}
			else{
				x--;
				swap(right_side,left_side);
				swap(vertical_side,left_side);
			}
			// 
			is_up = !is_up;
		}
		mp[make_pair(x,y)] = true;
	}

	cout << mp.size() << endl;
}