#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {

    string S;
    cin >> S;
    int N = S.size();

    int cnt = 0;
    int i = 0;
    for (; i < N; ++i) {
        for (int j = i + 1; j < N; ++j) {
            if (S[j] == 'n') {
                cnt += 1;
                i = j + 1;
                break;
            }
        }
    }

    cout << cnt << endl;

    return 0;
}