import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String input = sc.next() + sc.next();
        int count = 0, max = 0;
        for(int i=0;i<14;i++){
            if(input.charAt(i) == 'o'){
                count = 0;
                for(int j=i;j<14;j++){
                    if(input.charAt(j) != 'o')break;
                    count++;
                }
                max = Math.max(max,count);
            }  
        }
        System.out.println(max);
    }
}