import java.util.Scanner;

class Y203{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
        String w1=sc.next();
        String w2=sc.next();
        int count=0;
        int ans=-2000000000;
        for(int i=0;i<w1.length();i++){
            char ch=w1.charAt(i);
            if(ch=='o'){
                count++;
            }else{
                count=0;
            }
            if(ans<=count){
                ans=count;
            }
        }
        for(int i=0;i<w2.length();i++){
            char ch=w2.charAt(i);
            if(ch=='o'){
                count++;
            }else{
                count=0;
            }
            if(ans<=count){
                ans=count;
            }
        }
        System.out.println(ans);
    }
}