import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        String s=sc.next();
        String s2=sc.next();
        int count=0;
        int max=0;

        for( int i=0; i<7; i++){
            char c=s.charAt(i);
            if( c=='o'){
                count++;
            }else {
                count=0;
            }
            if(max<count){
                max=count;
            }
        }

        for( int i=0; i<7; i++){
            char c=s2.charAt(i);
            if( c=='o'){
                count++;
            }else {
                count=0;
            }
            if(max<count){
                max=count;
            }
        }

        System.out.println(max);

        sc.close();
	}
}