package yukicoder;

import java.util.ArrayList;
import java.util.Scanner;

public class Yuki203 {

	public static void main(String[] args) {
	
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		String str1 = scan.next();
		ArrayList<String> strArray = new ArrayList<String>();
		scan.close();
		characterSet(strArray,str);
		characterSet(strArray,str1);
		
		int num = 0;
		int ans = 0;
		for ( String i : strArray ){
			if ("o".equals(i)) {
				num++;
				
				if(ans < num){
					ans = num;
				}
				
			} else {
				
				if(ans < num){
					ans = num;
				}
				num = 0;
			}
		}
		System.out.println(ans);

	}
	
	private static void characterSet(ArrayList<String> strArray ,String str) {

		for(int i = 0; i < str.length(); i++ ){
			strArray.add(String.valueOf(str.charAt(i)));
		}
	}
}