using System;
using System.Collections.Generic;

class Program
{
    static string InputPattern = "Input4";

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

        if (InputPattern == "Input1") {
            WillReturn.Add("oxxoxxo");
            WillReturn.Add("ooooxxo");
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("ooxxxxx");
            WillReturn.Add("ooooooo");
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("oxxxxxo");
            WillReturn.Add("oxxxxxo");
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        string DayStr = InputList[0] + InputList[1];

        int CurrSeqCnt = 0;
        int MaxSeqCnt = 0;

        foreach (char EachChar in DayStr) {
            if (EachChar == 'o') CurrSeqCnt++; //休日だった場合
            else CurrSeqCnt = 0;//平日だった場合

            if (MaxSeqCnt < CurrSeqCnt)
                MaxSeqCnt = CurrSeqCnt;
        }
        Console.WriteLine(MaxSeqCnt);
    }
}