#include <iostream>
#include<queue>
#include<stack>
#include<vector>
#include<set>
#include<map>
#include<algorithm>
#include<cstring>
#include<string>
#include<cassert>
#include<cmath>
#include<climits>
#include<iomanip>
#include<bitset>
#include<unordered_map>

using namespace std;

#define REP(i,n) for(ll (i)=0;(i)<(n);(i)++)
#define rep(i,j,n) for(ll (i)=(j);(i)<(n);(i)++)
#define FOR(i,c) for(decltype((c).begin())i=(c).begin();i!=(c).end();++i)
#define ll long long
#define ull unsigned long long
#define all(hoge) (hoge).begin(),(hoge).end()
#define en '\n'
typedef pair<ll, ll> P;
const long long INF = 1LL << 60;
const long long MOD = 1e9 + 7;
typedef vector<ll> Array;
typedef vector<Array> Matrix;
const int loose = 0;
const int tight = 1;

template<class T> inline bool chmin(T& a, T b) {
	if (a > b) {
		a = b;
		return true;
	}
	return false;
}
template<class T> inline bool chmax(T& a, T b) {
	if (a < b) {
		a = b;
		return true;
	}
	return false;
}

//グラフ関連
struct Edge {//グラフ
	ll to, cap, rev;
	Edge(ll _to, ll _cap, ll _rev) {
		to = _to; cap = _cap; rev = _rev;
	}
};
typedef vector<Edge> Edges;
typedef vector<Edges> Graph;

void add_edge(Graph& G, ll from, ll to, ll cap, bool revFlag, ll revCap) {
	G[from].push_back(Edge(to, cap, (ll)G[to].size()));
	if (revFlag)G[to].push_back(Edge(from, revCap, (ll)G[from].size() - 1));
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	string s;
	cin >> s;

	ll con = 0;
	ll ans = 0;

	REP(j, 2) {
		con = 0;
		string t;
		REP(i, s.size()) {
			if (s[i] == 'h') continue;
			if (s[i] == 'e') t += "h";
			else t += s.substr(i, 1);
			//1の操作をできるだけ
			if (i + 5 > s.size()) continue;
			if (s.substr(i, 5) == "phnom") {
				con++;
				t += "hn";
				i += 4;
			}
		}
		if (s == t) {
			cout << ans << en;
			return 0;
		}
		else {
			ans++;
			ans += con;
		}
		s = t;
		t = "";
	}

	if (con == 0) {
		cout << ans << en;
		return 0;
	}
	else {
		con = 0;
	}

	bool flag = false;
	REP(i, s.size()-1) {
		if (flag) {
			if (s.substr(i, 2) == "om") {
				con++;
				i += 1;
			}
			else {
				flag = false;
			}
		}
		if (!flag) {
			if (i + 5 > s.size()) break;
			if (s.substr(i, 5) == "phnom") {
				con ++;
				i += 4;
				flag = true;
			}
		}
	}
	ans += con * 2 + 1;
	cout << ans << en;

	return 0;
}