#include <iostream>
#include <string>
using namespace std;

int count_cpctf_substrings(const string &S) {
    int N = S.length();
    int count = 0;
    
    for (int i = 0; i <= N - 5; ++i) {
        string substring = S.substr(i, 5);
        
        if(substring[0] == substring[2] &&
           substring[1] != substring[3] && substring[1] != substring[4] && substring[3] != substring[4]) {
           	count++;
           }
    }
    
    return count;
}

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

    cout << count_cpctf_substrings(S) << endl;
    return 0;
}