import java.util.*;
 
public class Main {
	public static void main(String[] args) {
 
	Scanner sc  = new Scanner(System.in);
        
    int cnt1 = 0;
    int ans = 0;

	int f=0;
		
    for(int i=0;i<2;i++){
        String s1 = sc.next();
        char[] c1 = s1.toCharArray();
            for(int k=0;k<s1.length();k++){
                if(c1[k]=='o')
                {
                    f++;
                    ans = Math.max( ans  , f );
                }else{
                    f=0;
                }
        }
    }


        System.out.print(ans);
        System.out.println();
	}
        
}