import java.util.Scanner;
public class Main{
	private static Scanner sc=new Scanner(System.in);
	public static void main(String args[])throws Exception{
		char are[]=(sc.nextLine()+sc.nextLine()).toCharArray();
		int max=0,counter=0;
		for(char element:are){
			if(element == 'o'){
				counter++;
			}else{
				max=Math.max(max,counter);
				counter=0;
			}
		}max=Math.max(max,counter);
		System.out.println(max);
	}
}