import java.io.*;
import java.util.*;
import java.math.*;

class Main203 {
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		String line1 = br.readLine();
		String line2 = br.readLine();
		String line3 = line1 + line2;
		
		int ans = 0, cnt = 0;
		for (int i = 0; i < line3.length(); i++) {
			char c = line3.charAt(i);
			if (c == 'o') {
				cnt++;
			} else {
				ans = Math.max(ans, cnt);
				cnt = 0;
			}
		}
		System.out.println(Math.max(ans , cnt));
	}
}