//
// validator (tester)
//

#include <bits/stdc++.h>

#include "testlib.h"

using namespace std;

const int MIN_N = 2;
const int MAX_N = 300000;

int main() {
    registerValidation();

    int n = inf.readInt(MIN_N, MAX_N);
    inf.readEoln();
    string s = inf.readString();
    ensure(s.size() == n);
    for (char c : s) ensure(c == 'i' || c == 'n');
    inf.readEof();

    return 0;
}