#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000000000000



int main(){
	
	vector<string> T = {"abc","cab","bca"};
	
	string S;
	cin>>S;

	set<pair<int,int>> A;
	
	int x=0,y=0;
	A.insert({x,y});
	
	int now = 0;
	
	for(int i=0;i<S.size();i++){
		int ind;
		for(int j=0;j<3;j++){
			if(T[now][j]==S[i]){
				ind = j;
				break;
			}
		}
		
		now = (now+ind)%3;
		if(i%2==0){
			if(ind==0)x--,y--;
			if(ind==1)x++,y--;
			if(ind==2)y+=2;
		}
		else{
			if(ind==0)x++,y++;
			if(ind==1)y-=2;
			if(ind==2)x--,y++;
		}
		A.insert({x,y});
	}
	
	cout<<A.size()<<endl;
	
	
	return 0;
}