using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

//YukiCoder418 ミンミンゼミ
//http://yukicoder.me/problems/no/418
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("mi--nminminminmi-------n");
            //5
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        string S = InputList[0];
        Console.WriteLine(Regex.Matches(S, "mi-*n").Count);
    }
}