#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;

	vector<pair<long double,long double>> A;
	
	long double x=0.0,y=0.0;
	A.emplace_back(x,y);
	
	int now = 0;
	long double L = 1.0;
	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-=L,y-=1.0;
			if(ind==1)x+=L,y-=1.0;
			if(ind==2)y+=2.0;
		}
		else{
			if(ind==0)x+=L,y+=1.0;
			if(ind==1)y-=2.0;
			if(ind==2)x-=L,y+=1.0;
		}
		A.emplace_back(x,y);
	}
	
	sort(A.begin(),A.end());
	long double eps = 1e-10;
	int ans = 0;
	
	for(int i=0;i<A.size();i++){
		if(i==0||abs(A[i].first-A[i-1].first)>eps||abs(A[i].second-A[i-1].second)>eps)ans++;
	}
	cout<<ans<<endl;
	
	
	return 0;
}