import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int count = 0, tmpCount = 0;
        String str = scan.next() + scan.next() + "d";
        String[] strArray = str.split("");
        for (String holiday : strArray) {
            if (holiday.equals("o")) {
                tmpCount += 1;
            } else {
                if (tmpCount > count) {
                    count = tmpCount;
                }
                tmpCount = 0;
            }
        }
        System.out.println(count);
    }
}