#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<string>
#include<sstream>
#include<math.h>
using namespace std;


int main(){

  string str1;
  string str2;
  cin >> str1;
  cin >> str2;

  string str = str1 + str2;

  int cnt=-1;
  int tmp=0;
  for(int i=0;i<str.size();i++){
    if(str[i] == 'o'){
      tmp++;
    }else{
      if(cnt < tmp) cnt = tmp;
      tmp=0;
    }
  }
  if(cnt < tmp) cnt = tmp;
  cout << cnt << endl;

  return 0;
}