// No.418 ミンミンゼミ
// https://yukicoder.me/problems/no/418
//

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

int solve(string &S);

int main() {
    string S;
    cin >> S;

    int ans = solve(S);
    cout << ans << endl;
}

int solve(string &S) {
    int ans = 0;
    regex rx(R"(mi-*n)");
    sregex_token_iterator it(S.begin(), S.end(), rx, -1);
    sregex_token_iterator end;
    while (it != end) {
        it++;
        ans++;
    }
    return ans;
}