using System;
using System.IO;
using System.Linq;

namespace ConsoleApp4
{
    class Program
    {
        static void Main()
        {
            var C1 = Console.ReadLine();
            var C2 = Console.ReadLine();

            var bind_C = C1 + C2;
            var cnt = 0;
            var ans = 0;

            foreach (var i in bind_C)
            {
                if (i == 'o')
                {
                    cnt++;
                }
                else 
                {
                    ans = Math.Max(ans, cnt);
                    cnt = 0;
                }

            }
            ans = Math.Max(ans, cnt);
            Console.WriteLine(ans);
        }
    }
}