#include <bits/stdc++.h>

int main() {

  std::string str1, str2;
  char str[16];
  int ans = 0;

  std::cin >> str1 >> str2;
  str1 += str2;
  strcpy(str, str1.c_str());

  for(int i = 0; i < 14; ++i) {
    if( str[i] == 'o' ) {
      for(int j = i+1; j <= 14; ++j) {
	if( str[i] != str[j] ) {
	  ans = std::max(ans, j-i);
	  i = j-1;
	  break;
	}
      }
    }
  }

  std::cout << ans << std::endl;

  return 0;
}