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

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("ilovechiwawa");
            //6
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("wachiwachi");
            //-1
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("chiwaaaaaaamikawayadeeeeesu");
            //16
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();

        IEnumerable<Match> MatchEnum =
            Regex.Matches(InputList[0], "c[^c]*?w.*?w").Cast<Match>();
        Console.WriteLine(MatchEnum.Any() ? MatchEnum.Max(X => X.Value.Length) : -1);
    }
}