import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;

public class No00000203_Main {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		List<String> holidayArr = Arrays.asList((br.readLine() + br.readLine()).split("x+"));

		int max = 0;
		for(String holiday : holidayArr) {
			if(holiday.length() > max) {
				max = holiday.length();
			}
		}
		System.out.println(max);;
	}
}