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

public class yukicoder
{
    public static void Main()
    {
        int c = 0;
        int w = 0;
        
        foreach(char ch in Console.ReadLine())
        {
            if(ch == 'c')
                c++;
            else
                w++;
        }
        
        if(c > w)
            Console.WriteLine(w);
        else
            Console.WriteLine(c - 1);
            
    }
}