import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        int weekday = 0;
        String days = in.nextLine();
        days += in.nextLine();

        for(int i=0, current=0; i<days.length(); i++){
            if(days.charAt(i) == 'o'){
                current++;
            } else {
                current = 0;
            }
            
            if(weekday < current){
                weekday = current;
            }
        }
        System.out.println(weekday);
   }
}