import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.Arrays;

import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        int[] days = new int[14 + 1];
        String[] inputs = reader.readLine().split("");
        for (int i = 0; i < 7; i++) {
            if (inputs[i].equals("o")) {
                days[i + 1] = 1;
            } else {
                days[i + 1] = 0;
            }
        }

        inputs = reader.readLine().split("");
        for (int i = 7; i < 14; i++) {
            if (inputs[i - 7].equals("o")) {
                days[i+1] = 1;
            } else {
                days[i+1] = 0;
            }
        }
        for (int i = 1; i <= 14; i++) {
            if (days[i] == 0) {
            } else {
                days[i] = days[i] + days[i - 1];
            }
        }
        int longest=0;
        for (int i = 0; i <= 14; i++) {
            longest = Math.max(longest,days[i]);
        }
        System.out.println(longest);
    }
}