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

class Program
{
    public void Solve()
    {
        string S = Console.ReadLine();

        int wIdx = S.IndexOf('w');
        int wCnt = S.Length - wIdx;
        int cCnt = S.Length - wCnt;

        Console.WriteLine(0 < (cCnt - 2) - (wCnt - 1) ? wCnt : cCnt - 1);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}