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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var ss = Console.ReadLine();
            var nc = ss.Count(c => c == 'c');
            var nw = ss.Count(c => c == 'w');
            Console.WriteLine(Math.Min(nc - 1, nw));
            Console.ReadLine();
        }
    }
}