using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            string a = Console.ReadLine();
            a += Console.ReadLine();
            char[] c = a.ToCharArray();
            int cnt = 0;
            int ans = 0;

            for (int i = 0; i < c.Length; i++)
            {
                if (c[i]=='o')
                {
                    cnt++;
                    if (cnt > ans)
                    {
                        ans = cnt;
                    }
                }
                else
                {
                    cnt = 0;
                }
            }

            Console.WriteLine(ans);
        }
    }
}