using System;
using System.Linq;

public class P0203 {
    public static void Main() {
        var c1 = Console.ReadLine().Trim();
        var c2 = Console.ReadLine().Trim();
        var result = 0;
        var count = 0;
        foreach(char c in (c1+c2).ToCharArray()) {
            if(c == 'o') {
                count += 1;
                result = Math.Max(result, count);
            } else {
                count = 0;
            }
        }
        Console.WriteLine(result);
    }
}