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;
            string a = "";

            for (int i = 0; i < 2; i++)
            {
  
                for (int j = 0; j < 7; j++)
                {
                    if (i == 0)
                    {
                        a = s.Substring(j, 1);

                    }
                    else
                    {
                        a = s1.Substring(j, 1);
                    }

                    if (a == "o")
                    {
                        count++;
                    }
                    if (a == "x")
                    {
                        if (count > ans)
                        {
                            ans = count;
                        }
                        count = 0;
            
                    }
                    if (j == 6)
                    {
                        if (count > ans)
                        {
                            ans = count;
                        }
                        break;
                    }
                }
                
            }
          
            Console.WriteLine(ans);

        }

    }
}