#include <string>
#include <vector>
#include <list>
#include <algorithm>
#include <map>
#include <set>
#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;

class CollectingRiders {
  public:
    int minimalMoves(vector <string> board);
};

int CollectingRiders::minimalMoves(vector <string> board)
{
  return 0;
}