import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	  String line = stdReader.readLine();
	    	  String line2 = stdReader.readLine();
	    	  int max = -1;
	    	  int count = 0;
	    	  for(int i=0;i<line.length();i++){
	    		  if((""+line.charAt(i)).equals("o")){
	    			  count++;
	    		  }else{
	    			  if(max<count)max = count;
	    			  count = 0;
	    		  }
	    	  }
	    	  
	    	  for(int i=0;i<line2.length();i++){
	    		  if((""+line2.charAt(i)).equals("o")){
	    			  count++;
	    		  }else{
	    			  if(max<count)max = count;
	    			  count = 0;
	    		  }
	    	  }
			  if(max<count)max = count;
	    	  System.out.println(max);
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}
}