using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        string S = Console.ReadLine();

        int ans = 0;
        string min = "";
        foreach (char c in S)
        {
            switch (c)
            {
                case 'm':
                    min = c.ToString();
                    break;

                case 'i':
                    if (0 < min.Length && min.Substring(0, 1) == "m") { min += c; }
                    break;

                case '-':
                    if (0 < min.Length && min.Substring(0, 2) == "mi") { min += c; }
                    break;

                case 'n':
                    if (0 < min.Length && min.Substring(0, 2) == "mi") { ans++; }
                    break;

                default:
                    min = "";
                    break;
            }
        }
        Console.WriteLine(ans);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}