#include <bits/stdc++.h>
using namespace std;
int main() {
	string s;
	cin >> s;
	int flag = 0, ans = 0;
	for(int i = 0; i < s.length(); i++) {
		if((s[i] == 'm')||(s[i] == 'i')||(s[i] == '-')||(s[i] == 'n')) {
			if(s[i] == 'm') {
				flag = 1;
			} else if(s[i] == 'i') {
				if(flag == 1) {
					flag = 2;
				} else {
					flag = 0;
				}
			} else if(s[i] == '-') {
				if(flag != 2) {
					flag = 0;
				}
			} else if(s[i] == 'n') {
				if(flag == 2) {
					ans++;
					flag = 0;
				} else {
					flag = 0;
				}
			}
		} else {
			flag = 0;
		}
	}
	cout << ans << endl;

	return 0;
}