import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No0203 {

	public static void main(String[] args){
		try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))){
			char c1[] = br.readLine().toCharArray();
			char c2[] = br.readLine().toCharArray();
			int ans = Counter(c1, c2);
			System.out.println(ans);

		}catch(IOException e){
			e.printStackTrace();
		}
	}

	public static int Counter(char c1[], char c2[]){
		int ans = 0;
		int buf = 0;

		for(int i=0; i<c1.length; i++){
			if(c1[i] == 'o'){
				buf++;
			}else{
				ans = Math.max(buf, ans);
				buf = 0;
			}
		}
		for(int i=0; i<c2.length; i++){
			if(c2[i] == 'o'){
				buf++;
			}else{
				ans = Math.max(buf, ans);
				buf = 0;
			}
		}
		ans = Math.max(buf, ans);

		return ans;
	}
}