// source problem : 
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define int long long
#define lb lower_bound
#define ub upper_bound
#define MASK(i) (1LL << (i))
const int inf = 1e18;
void ckmax(int& f, int s)
{
    f = (f > s ? f : s);
}
void ckmin(int& f, int s)
{
    f = (f < s ? f : s);
}
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    string s;
    cin >> s;
    int t = 0, ans = 0;
    for (char c : s) {
        if (c == 'H' && t == 0) t++;
        else if (c == 'O' && t == 1) t++;
        else if (c == 'N' && t == 2) t++;
        else if (c == 'I' && t == 3) t = 0, ans++;
    }   
    cout << ans;
    return 0;
}
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