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

namespace yukikoda
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();

            int c = s.Where(x => x == 'c').Count() -1;
            int w = s.Where(x => x == 'w').Count() ;

            Console.WriteLine(Math.Min(c, w));
        }
    }
}