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

public class YukiCoder
{
    public static void Solve()
    {
        string S = MyConsole.String();

        S = S.Replace( "-", "");

        string[] strs = S.Split( new []{"m"}, StringSplitOptions.RemoveEmptyEntries );

        int ans = strs.Count( s => s.Equals( "in" ) );

        MyConsole.wLine( ans.ToString() );
    }

    public static void Main()
    {
        MyConsole.Read(); Solve(); MyConsole.Finish();
    }
}

public static class MyConsole
{
    private static List<string> ReadedLine = new List<string>();
    private static char[] buf = new char[1024];
    private static int i;

    public static void Read()
    {
        TextReader sr = Console.In;

        int Len = sr.Read( buf, 0, 1024 );
        var Line = string.Empty;

        for (int i = 0 ; i < Len ; i++)
        {
            if (buf[i] >= 33 && buf[i] <= 126)
            {
                Line += buf[i];
            }
            else if (Line.Length > 0)
            {
                ReadedLine.Add( Line );
                Line = string.Empty;
            }

        }
        if (Line.Length > 0) ReadedLine.Add( Line );

        Console.SetOut( new StreamWriter( Console.OpenStandardOutput() ) { AutoFlush = false } );
    }

    public static string String() { return ReadedLine[i++]; }
    public static int Int() { return int.Parse( ReadedLine[i++] ); }
    public static long Long() { return long.Parse( ReadedLine[i++] ); }
    public static double Double() { return double.Parse( ReadedLine[i++] ); }

    public static void wLine( string output = null )
    {
        Console.WriteLine( output );
    }

    public static void Finish()
    {
        Console.Out.Flush();
    }
}