using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            string s1 = Console.ReadLine();
            int count = 0;
            int ans = 0;
            for(int i = 0; i < 7; i++)
            {
                string a = s.Substring(i, 1);
                if(a== "o")
                {
                    count++;
                }
                if(a== "x")
                {
                    if (count > ans)
                    {
                        ans = count;
                    }
                    count = 0;
                }else if(i == 6)
                {
                    if (count > ans)
                    {
                        ans = count;
                    }
                }
            }
            for (int i = 0; i < 7; i++)
            {
                string a = s1.Substring(i, 1);
                if (a == "o")
                {
                    count++;
                }
                if (a == "x"||i==6)
                {
                    if (count > ans)
                    {
                        ans = count;
                    }
                    count = 0;
                }
            }
            Console.WriteLine(ans);
        }
    }
}