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

class Program
{
    static void Main()
    {
        var inp = Console.ReadLine();
        var searchChiwawa = new SearchString();
        searchChiwawa.SearchChiwawa(inp);
    }
}
class SearchString
{
    public void SearchChiwawa(string alph)
    {
        // 正規表現でcww文字列を検索
        Match regResult = Regex.Match(alph, "c?w.?w");
        var strCount = regResult.Value;
        var ans = strCount.Count();
        Console.WriteLine(ans);
    }
}