#include <algorithm>
#include <functional>
#include <iostream>
#include <iomanip>
#include <vector>
#include <map>
#include <set>
#include <unordered_set>
#include <queue>
#include <numeric>
#include <bitset>
#include <cmath>
#include <random>
#include "list"

using namespace std;
using ll = long long;
using ull = unsigned long long;
//const ll mod = 998244353;
const ll mod = 1000000007;
const int inf = 1e9;
const ll linf = 1e18;
const int DX[] = {1, -1, 0, 0};
const int DY[] = {0, 0, 1, -1};


#define rep(i, n) for (ll i = 0; i < (n); ++i)
#define rep_from(i, j, n) for (ll i = (j); i < (n); ++i)
#define rep_rev(i, n) for (ll i = n-1; i >= 0; --i)
#define rep_from_rev(i, j, n) for (ll i = n-1; i >= j; --i)
#define all(x) (x).begin(),(x).end()
#define sz(x) ll(x.size())

template<typename T>
inline T chmax(T &a, const T b) { return a = (a < b) ? b : a; }

template<typename T>
inline T chmin(T &a, const T b) { return a = (a > b) ? b : a; }

ll power(ll base, ll exponent) {
  if (exponent % 2) {
    return power(base, exponent - 1) * base % mod;
  } else if (exponent) {
    ll root_ans = power(base, exponent / 2);
    return root_ans * root_ans % mod;
  } else { return 1; }
}

ll inverse(ll x) { return power(x, mod - 2); }
ll gcd(ll a, ll b) {
  if (a < b) gcd(b, a);
  ll r;
  while (r = a % b) {
    a = b;
    b = r;
  }
  return b;
}

template<typename T>
ll sum(T begin, T end) { return accumulate(begin, end, 0ll); }

template<typename T>
struct combination {
    vector<ll> fact, inv;

    combination(int sz) : fact(sz + 1), inv(sz + 1) {
      fact[0] = 1;
      for (int i = 1; i <= sz; i++) { fact[i] = fact[i - 1] * i % mod; }
      inv[sz] = power(fact[sz], mod - 2);
      for (int i = sz - 1; i >= 0; i--) { inv[i] = inv[i + 1] * (i + 1) % mod; }
    }

    T C(int p, int q) const {
      if (q < 0 || p < q) return 0;
      return T(fact[p] * inv[q] % mod * inv[p - q] % mod);
    }

    T P(int p, int q) const {
      if(p < 0 || p < q) return 0;
      return T(fact[p] * inv[p - q] % mod);
    }
};

using Pair = pair<int, int>;
using LPair = pair<ll, ll>;

template<ll Modulus>
struct ModInt {
    ll a;

    constexpr ModInt(const ll x = 0) noexcept: a((x % mod + mod) % mod) {}

    constexpr ll &value() noexcept { return a; }

    constexpr const ll &value() const noexcept { return a; }

    constexpr ModInt operator+(const ModInt x) const noexcept {
      return ModInt(*this) += x;
    }

    constexpr ModInt operator-(const ModInt x) const noexcept {
      return ModInt(*this) -= x;
    }

    constexpr ModInt operator*(const ModInt x) const noexcept {
      return ModInt(*this) *= x;
    }

    constexpr ModInt operator/(const ModInt x) const noexcept {
      return ModInt(*this) /= x;
    }

    constexpr ModInt &operator+=(const ModInt x) noexcept {
      a += x.a;
      if (a >= Modulus) {
        a -= Modulus;
      }
      return *this;
    }

    constexpr ModInt &operator-=(const ModInt x) noexcept {
      if (a < x.a) {
        a += Modulus;
      }
      a -= x.a;
      return *this;
    }

    constexpr ModInt &operator*=(const ModInt x) noexcept {
      a = a * x.a % Modulus;
      return *this;
    }

    constexpr ModInt &operator/=(ModInt x) noexcept {
      ll exp = Modulus - 2;
      while (exp) {
        if (exp % 2) {
          *this *= x;
        }
        x *= x;
        exp /= 2;
      }
      return *this;
    }

    constexpr ModInt operator-() noexcept {
      return ModInt(-a);
    }

    friend ostream &operator<<(ostream &os, const ModInt &m) {
      os << m.a;
      return os;
    }
};

using mint = ModInt<mod>;

struct UnionFind {
    vector<int> par;
    vector<int> next;

    UnionFind(int n) : par(n, -1), next(n) {iota(all(next), 0);}

    int root(int x) {
      if (par[x] < 0)
        return x;
      return par[x] = root(par[x]);
    }

    void unite(int x, int y) {
      x = root(x);
      y = root(y);
      if (x == y)
        return;
      if (par[x] > par[y])
        swap(x, y);
      par[x] += par[y];
      par[y] = x;
      swap(next[x], next[y]);
    }

private:
    void unite_list(int x, int y) {

    }

    bool same(int x, int y) {
      int rx = root(x);
      int ry = root(y);
      return rx == ry;
    }
    int size(int x) { return -par[root(x)]; }
};


int main() {
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  ll h, w, cy, cx, dy, dx;
  cin >> h >> w >> cy >> cx >> dy >> dx;
  cy--;cx--;dy--;dx--;
  vector<string> s(h);
  rep(i, h) cin >> s[i];
  vector<vector<int>> g(h, vector<int>(w));
  rep(i, h) {
    rep(j ,w) {
      if(s[i][j] == '#') g[i][j] = inf;
    }
  }
  deque<Pair> q;
  q.emplace_front(cy, cx);
  vector<vector<int>> dp(h, vector<int>(w, inf));
  dp[cy][cx] = 0;
  while(q.size()) {
    auto cur = q.front();q.pop_front();
    int i = cur.first;
    int j = cur.second;
    if(i == dy && j == dx) {
      cout << dp[i][j] << endl;
      return 0;
    }
    rep(k, 4) {
      int y = DY[k] + i;
      int x = DX[k] + j;
      if(y < 0 || h <= y || x < 0 || w <= x) continue;
      if(s[y][x] == '#') continue;
      if(dp[y][x] <= dp[i][j]) continue;
      dp[y][x] = dp[i][j];
      q.emplace_front(y, x);
    }
    for(int y = i - 2; y <= i + 2; y++) {
      for(int x = j - 2; x <= j + 2; x++) {
        if(y < 0 || h <= y || x < 0 || w <= x) continue;
        if(s[y][x] == '#') continue;
        if(dp[y][x] < inf) continue;
        dp[y][x] = dp[i][j] + 1;
        q.emplace_back(y, x);
      }
    }
  }
  cout << - 1<< endl;
}

Measured memory_bytes: 12596