import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        int ans = 0;
        int tmp = 0;
        boolean con = false;
        String days = scan.next() + scan.next();

        for (int i = 0; i < 14; i++) {
            if (days.substring(i, i+1).equals("o")) {
                if (con) tmp++;
                else tmp = 1;
                if (tmp > ans) ans = tmp;
                con = true;
            } else {
                tmp = 0;
                con = false;
            }
        }

        System.out.println(ans);
    }
}