#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
using namespace std;


#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

typedef long long ll;
typedef unsigned long long ull;
typedef long double lb;
/* ここからが本編 */


int main(void)
{
   int i,j,k,l;
   int cnt = 0;
   int ans = 0;
   char s1[16];
   char s2[8];
   cin >> s1 >> s2;
   strcat(s1,s2);
   for(i=0;i<14;i++) {
      if(s1[i] == 'o') {
         cnt = 1;
         i++;
         for(;i<14;i++) {
            if(s1[i] == 'x') break;
            cnt++;
         }
         if(cnt > ans) ans = cnt;
      }
   }
   cout << ans << endl;
   return 0;
}