import java.util.Scanner;
public class Gw{
	public static void main(String[] arg){
		String w1,w2;
		int temp=0,res = 0;
		Scanner sc = new Scanner(System.in);
		w1 = sc.next();
		w2 = sc.next();
		for(int i=0;i<7;i++){
			if(w1.charAt(i) == 'o'){
				temp++;
			}else{
				if(res < temp)res = temp;
				temp = 0;
			}
		}
		for(int i=0;i<7;i++){
			if(w2.charAt(i) == 'o'){
				temp++;
			}else{
				if(res<temp)res = temp;
				temp = 0;
			}
		}
		if(res<temp)res = temp;
		System.out.println(res);
	}
}