package m.shin;
import java.util.Scanner;
public class Con203 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String[] w = {s.next() , s.next()};
		s.close();

		int max = 0 , k = 0;
		for(int i = 0;i < 2;i++){
			for(int j = 0;j < 7;j++){
				if(w[i].charAt(j) == 'o'){
					k++;
				}else{
					max = Math.max(max, k);
					k = 0;
				}
			}
		}
		max = Math.max(max, k);
		System.out.println(max);

	}

}