#include "bits/stdc++.h"
#define rep(i, j) for (int i = 0; i < j; i++)
#define srep(i, j, k) for (int i = j; i < k; i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;
using ull = unsigned long long;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

//�G���g�X�e�l�X���
vector<int> estora(vector<int> num) {
    int sel = 0;
    while (sel < num.size()) {
        int d = num[sel];
        for (int i = 0; i < num.size(); i++) {
            if (num[i] % d == 0 && num[i] != d && d != 1) {
                num.erase(num.begin() + i);
                i--;
            }
        }
        sel++;
    }
    return num;
}
/*���C�u�����ő����*/
//���[�O���b�h�̌ݏ��@
int gcd(int x, int y) {
    int num[3];
    num[0] = (x > y) ? x : y;
    num[1] = (x <= y) ? x : y;
    num[2] = num[0] % num[1];

    while (num[2]) {
        num[0] = num[1];
        num[1] = num[2];
        num[2] = num[0] % num[1];
    }

    return num[1];
}

/*�f��������*/
//���색�C�u����
//i����ɑf���ɂ��Ă����Ȃ��Ƃ��܂��ł��Ȃ�&&�v�Z�ʃ��o�C
//�G�X�g���l�X��⿂őf����U����Ă����K�v�������肻��
vector<ll> fac(ll n, vector<ll> num) {
    ll kazu = n;
    for (int i = 2; i <= n; i++) {
        while (1) {
            if (kazu % i != 0) break;

            kazu /= i;
            num[i]++;
        }
    }
    if (kazu == n && n != 1)
        num[n]++;
    return num;
    int ans = 0;
    if (kazu != 1) ans++;
    for (int i = 2; i <= sqrt(n); i++) {
        for (int j = 1; j <= num[i]; j++) {
            num[i] -= j;
            ans++;
        }
    }
    return num;
}
const int INF = 1001001001;

//mint�p�̒萔 (10��9�� + 7)
const int mod = 1000000007;

struct mint {
    ll x; // typedef long long ll;
    mint(ll x = 0) :x((x% mod + mod) % mod) {}
    mint operator-() const { return mint(-x); }
    mint& operator+=(const mint a) {
        if ((x += a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint a) {
        if ((x += mod - a.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this; }
    mint operator+(const mint a) const { return mint(*this) += a; }
    mint operator-(const mint a) const { return mint(*this) -= a; }
    mint operator*(const mint a) const { return mint(*this) *= a; }
    mint pow(ll t) const {
        if (!t) return 1;
        mint a = pow(t >> 1);
        a *= a;
        if (t & 1) a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const { return pow(mod - 2); }
    mint& operator/=(const mint a) { return *this *= a.inv(); }
    mint operator/(const mint a) const { return mint(*this) /= a; }
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x; }
ostream& operator<<(ostream& os, const mint& a) { return os << a.x; }

int main() {
    int h, w;
    cin >> h >> w;
    P s;
    int gh, gw;
    cin >> s.first >> s.second >> gh >> gw;
    s.first--; s.second--; gh--; gw--;
    vector<string> ss(h);
    rep(i, h) cin >> ss[i];

    deque<P> masu;
    masu.push_front(s);

    vector<vector<int> > map(h, vector<int> (w, -1));
    map[s.first][s.second] = 0;
    while (!masu.empty()) {
        P current = masu.front(); masu.pop_front();
        vector<int> vec = { -2, -1, 0, 1, 2 };
        rep(i, vec.size()) {
            rep(j, vec.size()) {
                if (current.first + vec[i] >= 0 && current.first + vec[i] < h && current.second + vec[j] >= 0 && current.second + vec[j] < w) {
                    int cost = 0;
                    if (abs(vec[i]) + abs(vec[j]) >= 2)
                        cost = 1;
                    if (map[current.first + vec[i]][current.second + vec[j]] <= map[current.first][current.second] + cost && map[current.first + vec[i]][current.second + vec[j]] != -1) continue;
                    if (ss[current.first + vec[i]][current.second + vec[j]] == '#') continue;

                    map[current.first + vec[i]][current.second + vec[j]] = map[current.first][current.second] + cost;
                    P kari;
                    kari.first = current.first + vec[i];
                    kari.second = current.second + vec[j];
                    if (cost == 0)
                        masu.push_front(kari);
                    else
                        masu.push_back(kari);
                }
            }
        }
    }

    cout << map[gh][gw] << endl;
    return 0;
}


Measured memory_bytes: 9524