#include <bits/stdc++.h>
using namespace std;
using LL = long long int;
#define incID(i, l, r) for(int i = (l)    ; i <  (r); ++i)
#define decID(i, l, r) for(int i = (r) - 1; i >= (l); --i)
#define incII(i, l, r) for(int i = (l)    ; i <= (r); ++i)
#define decII(i, l, r) for(int i = (r)    ; i >= (l); --i)
#define inc(i, n)  incID(i, 0, n)
#define dec(i, n)  decID(i, 0, n)
#define inc1(i, n) incII(i, 1, n)
#define dec1(i, n) decII(i, 1, n)
#define inID(v, l, r) ((l) <= (v) && (v) <  (r))
#define inII(v, l, r) ((l) <= (v) && (v) <= (r))
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define MT make_tuple
#define FI first
#define SE second
#define FR front()
#define BA back()
#define ALL(v) v.begin(), v.end()
#define RALL(v) v.rbegin(), v.rend()
auto setmin   = [](auto & a, auto b) { return (b <  a ? a = b, true : false); };
auto setmax   = [](auto & a, auto b) { return (b >  a ? a = b, true : false); };
auto setmineq = [](auto & a, auto b) { return (b <= a ? a = b, true : false); };
auto setmaxeq = [](auto & a, auto b) { return (b >= a ? a = b, true : false); };
#define SI(v) static_cast<int>(v.size())
#define RF(e, v) for(auto & e: v)
#define until(e) while(! (e))
#define if_not(e) if(! (e))
#define ef else if
#define UR assert(false)
#define IN(T, ...) T __VA_ARGS__; IN_(__VA_ARGS__);
void IN_() { };
template<typename T, typename ... U> void IN_(T &  a, U &  ... b) { cin >> a; IN_(b ...); };
template<typename T                > void OUT(T && a            ) { cout << a << endl; }
template<typename T, typename ... U> void OUT(T && a, U && ... b) { cout << a << " "; OUT(b ...); }

// ---- ----

int main() {
	IN(string, s);
	
	int ans = 0;
	inc(k, 2) {
		inc(i, SI(s)) {
			if(s.substr(i, 5) == "phnom") {
				s[i + 1] = 'e';
				s[i + 3] = 'h';
				s[i + 4] = 'h';
				ans++;
			}
		}
		string t;
		RF(c, s) {
			if(c == 'h') { }
			ef(c == 'e') { t += 'h'; }
			else { t += c; }
		}
		if(t == s) { break; } else { ans++; }
		s = t;
	}
	
	vector<int> v;
	inc(i, SI(s)) {
		if(s.substr(i, 3) == "phn") {
			int x = 0;
			while(s.substr(i + 3 + 2 * x, 2) == "om") { x++; }
			v.PB(x);
		}
	}
	int sum = 0, ma = -1;
	RF(e, v) { sum += e; setmax(ma, e); }
	OUT(ans + sum + ma + 1);
}