#include<bits/stdc++.h>

using namespace std;

int main(){
        ifstream f("pscpld.in");
        ofstream g("pscpld.out");
        char s[1000001];
        f>>s;
        int i,j=0,sum=0;
        sum=strlen(s);
        for(i=0;i<=strlen(s)-1;i++){
                if(s[i]==s[i+1])sum++;
                if(s[i]==s[i+2])sum++;

                }

        g<<sum;
}