#include <iostream>
#include <string>
using namespace std;

int main(){
  string s,s1;
  cin >> s >> s1;
  s+=s1;
  int cnt=0;
  int max=0;
  for(int i=0;i<=14;i++){
    if(s[i]=='o')cnt++;
    else{if(cnt>max)max=cnt;cnt=0;}
  }
  cout << max << endl;
  return 0;
}