using System;

namespace yukicoder
{
    class Program
    {

        static void Main(string[] args)
        {
            var S = Console.ReadLine();
            
            string[] strings = new string[S.Length] ;
            int Mcnt = 0, Icnt = 0, Ncnt = 0 , anscnt = 0;
            
            for(int i = 0; i < S.Length ; i++)
            {
                strings[i] = S.Substring(i , 1);
            }
            
            for(int j  = 0; j < strings.Length ; j++)
            {
                if (strings[j] == "m")
                {
                    Mcnt++;
                }
                else if (strings[j] == "i")
                {
                    Icnt++;
                }
                else if (strings[j] == "n")
                {
                    Ncnt++;
                }
            }
            for(int x = 0; x < strings.Length; x++)
            {
                if (Mcnt > 0 && Icnt > 0 && Ncnt > 0)
                {
                    anscnt++;
                    Mcnt--;
                    Icnt--;
                    Ncnt--;
                }
                else
                {
                    Console.WriteLine(anscnt);
                    break;
                }
            }
        }
    }
}