using System;

class Program
{
    static void Main(string[] args)
    {
        int maxRest = 0;
        var str = "";

        for (int i = 0; i < 2; i++) str += Console.ReadLine();
        
        int count = 0;
        for (int i=0; i < str.Length; i++)
        {
            if (str[i] == 'o')
            {
                count++;
                maxRest = Math.Max(maxRest, count);
            }
            else count = 0;
        }
        Console.WriteLine(maxRest);
    }
}