#define MOD_TYPE 2

#pragma region Macros

#include <bits/stdc++.h>
using namespace std;

#if 1
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#endif

#if 0
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/tag_and_trait.hpp>
#include <ext/rope>
using namespace __gnu_pbds;
using namespace __gnu_cxx;
template <typename T>
using extset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#endif

#if 0
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using Int = boost::multiprecision::cpp_int;
using lld = boost::multiprecision::cpp_dec_float_100;
#endif

using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;
template <typename T>
using smaller_queue = priority_queue<T, vector<T>, greater<T>>;

constexpr ll MOD = (MOD_TYPE == 1 ? (ll)(1e9 + 7) : 998244353);
constexpr int INF = (int)1e9 + 10;
constexpr ll LINF = (ll)4e18;
constexpr ld PI = acos(-1.0);
constexpr ld EPS = 1e-7;
constexpr int Dx[] = {0, 0, -1, 1, -1, 1, -1, 1, 0};
constexpr int Dy[] = {1, -1, 0, 0, -1, -1, 1, 1, 0};

#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define REPI(i, m, n) for (int i = m; i < (int)(n); ++i)
#define repi(i, n) REPI(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << "\n"
#define Yes(n) cout << ((n) ? "Yes" : "No") << "\n"
#define possible(n) cout << ((n) ? "possible" : "impossible") << "\n"
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << "\n"
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << "\n";

struct io_init
{
  io_init()
  {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << setprecision(30) << setiosflags(ios::fixed);
  };
} io_init;
template <typename T>
inline bool chmin(T &a, T b)
{
  if (a > b)
  {
    a = b;
    return true;
  }
  return false;
}
template <typename T>
inline bool chmax(T &a, T b)
{
  if (a < b)
  {
    a = b;
    return true;
  }
  return false;
}
inline ll CEIL(ll a, ll b)
{
  return (a + b - 1) / b;
}
template <typename A, size_t N, typename T>
inline void Fill(A (&array)[N], const T &val)
{
  fill((T *)array, (T *)(array + N), val);
}
template <typename T, typename U>
constexpr istream &operator>>(istream &is, pair<T, U> &p) noexcept
{
  is >> p.first >> p.second;
  return is;
}
template <typename T, typename U>
constexpr ostream &operator<<(ostream &os, pair<T, U> &p) noexcept
{
  os << p.first << " " << p.second;
  return os;
}
#pragma endregion

// --------------------------------------

template <typename T>
struct dijkstra
{
  int V;
  T INF_d;
  struct edge
  {
    int to;
    T cost;
  };
  vector<vector<edge>> E;
  vector<T> d;
  using pt = pair<T, int>;
  dijkstra(int V_) : V(V_)
  {
    E.resize(V);
    d.resize(V);
    if (is_same<int, T>::value)
      INF_d = 2e9;
    else
      INF_d = 8e18;
  }

  void add_edge(int a, int b, T c = 1, bool directed = true)
  {
    E[a].emplace_back(edge{b, c});
    if (!directed)
      E[b].emplace_back(edge{a, c});
  }

  void calc(int s)
  {
    priority_queue<pt, vector<pt>, greater<pt>> que;
    fill(d.begin(), d.end(), INF_d);
    que.emplace(T(0), s);
    d[s] = 0;
    while (!que.empty())
    {
      pt p = que.top();
      que.pop();
      int v = p.second;
      if (d[v] < p.first)
        continue;
      for (auto &&e : E[v])
      {
        if (d[e.to] > d[v] + e.cost)
        {
          d[e.to] = d[v] + e.cost;
          que.emplace(d[e.to], e.to);
        }
      }
    }
  }
};

template <typename T>
inline void roll(int i, int j, int k, int l, T *a)
{
  T t = a[i];
  a[i] = a[j];
  a[j] = a[k];
  a[k] = a[l];
  a[l] = t;
}

enum
{
  U,
  F,
  R,
  L,
  B,
  D
};

/*
  .0..
  3124
  .5..

  .U..
  LFRB
  .D..
  
  .N.
  W.E
  .S.
*/

struct Dice
{
  int a[6];
  int &operator[](int i) { return a[i]; }
  Dice() { fill(a, a + 6, -1); }

  void roll_x() { roll(U, F, D, B, a); } // N
  void roll_y() { roll(U, R, D, L, a); } // W
  void roll_z() { roll(B, R, F, L, a); } // counter-clockwise
  void move(char c)
  {
    assert(c == 'E' or c == 'W' or c == 'N' or c == 'S');
    if (c == 'E')
      rep(i, 3) roll_y();
    if (c == 'W')
      roll_y();
    if (c == 'N')
      roll_x();
    if (c == 'S')
      rep(i, 3) roll_x();
  }
  int getR(int u, int f) // 右面の index
  {
    int res = -1;
    rep(i, 6)
    {
      rep(j, 4)
      {
        if (a[U] == u and a[F] == f)
          res = a[R];
        roll_z();
      }
      i & 1 ? roll_x() : roll_y();
    }
    return res;
  }
};

int Dtoi(Dice &d)
{
  rep(i, 6)
  {
    if (d[i] == 1)
      return i;
  }
  assert(0);
}

Dice itoD(int k)
{
  Dice dice;
  rep(i, 6) dice[i] = i == k;
  return dice;
}

bool Same(Dice &d1, Dice &d2)
{
  bool res = false;
  rep(i, 6)
  {
    rep(j, 4)
    {
      bool s = true;
      rep(k, 6)
      {
        if (d1.a[k] != d2.a[k])
        {
          s = false;
          break;
        }
      }
      res |= s;
      d2.roll_z();
    }
    i % 2 == 0 ? d2.roll_y() : d2.roll_x();
  }
  return res;
}

void solve()
{
  int h, w;
  cin >> h >> w;
  int si, sj, gi, gj;
  cin >> si >> sj >> gi >> gj;
  si--, sj--, gi--, gj--;
  string s[1000];
  rep(i, h) cin >> s[i];
  dijkstra<int> ds(h * w * 6);
  auto f = [&](int i, int j, int k)
  { return (i * w + j) * 6 + k; };
  rep(i, h) rep(j, w) rep(k, 6)
  {
    if (s[i][j] == '#')
      continue;
    Dice d = itoD(k);
    rep(di, 4)
    {
      int ii = i + Dx[di];
      int jj = j + Dy[di];
      if (ii < 0 or ii >= h or jj < 0 or jj >= w or s[ii][jj] == '#')
        continue;
      Dice nxt = d;
      if (di == 0)
        nxt.move('E');
      else if (di == 1)
        nxt.move('W');
      else if (di == 2)
        nxt.move('N');
      else if (di == 3)
        nxt.move('S');
      ds.add_edge(f(i, j, k), f(ii, jj, Dtoi(nxt)));
    }
  }
  ds.calc(f(si, sj, 0));
  int d = ds.d[f(gi, gj, 0)];
  if (d == ds.INF_d)
    cout << -1 << "\n";
  else
    cout << d << "\n";
}

int main()
{
  solve();
}