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

int main() {
    string s; cin >> s;
    int min_num = 0;
    int min_state = 0;
    
    for (char c : s) {
        if (c == 'm' && min_state == 0) {
            min_state = 1;
        } else if (c == 'i' && min_state == 1) {
            min_state = 2;
        } else if (c == '-' && min_state == 2) {
            min_state = 2;
        } else if (c == 'n' && min_state == 2) {
            ++min_num;
            min_state = 0;
        } else {
            min_state = 0;
        }
    }
    cout << min_num << endl;
}