#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include "bits/stdc++.h"

// Begin Header {{{
using namespace std;

#ifndef DEBUG
#define dump(...)
#endif

#define all(x) x.begin(), x.end()
#define rep(i, b, e) for (intmax_t i = (b), i##_limit = (e); i < i##_limit; ++i)
#define reps(i, b, e) for (intmax_t i = (b), i##_limit = (e); i <= i##_limit; ++i)
#define repr(i, b, e) for (intmax_t i = (b), i##_limit = (e); i >= i##_limit; --i)
#define var(Type, ...) Type __VA_ARGS__; input(__VA_ARGS__)

constexpr size_t    operator""_zu(unsigned long long value) { return value; };
constexpr intmax_t  operator""_jd(unsigned long long value) { return value; };
constexpr uintmax_t operator""_ju(unsigned long long value) { return value; };

constexpr int INF = 0x3f3f3f3f;
constexpr intmax_t LINF = 0x3f3f3f3f3f3f3f3f_jd;

template <class T, class Compare = less<>>
using MaxHeap = priority_queue<T, vector<T>, Compare>;
template <class T, class Compare = greater<>>
using MinHeap = priority_queue<T, vector<T>, Compare>;

using usize = size_t;
using imax = intmax_t;
using umax = uintmax_t;

inline void input() {}
template <class Head, class... Tail>
inline void input(Head&& head, Tail&&... tail) {
    cin >> head;
    input(forward<Tail>(tail)...);
}

template <class T>
inline istream& operator>>(istream &is, vector<T> &vec) {
    for (auto &e: vec) {
        is >> e;
    }
    return is;
}

inline void output() { cout << "\n"; }
template <class Head, class... Tail>
inline void output(Head&& head, Tail&&... tail) {
    cout << head;
    if (sizeof...(tail)) {
        cout << " ";
    }
    output(forward<Tail>(tail)...);
}

template <class T>
inline ostream& operator<<(ostream &os, const vector<T> &vec) {
    static constexpr const char *delim[] = {" ", ""};
    for (const auto &e: vec) {
        os << e << delim[&e == &vec.back()];
    }
    return os;
}

template <class T>
inline vector<T> makeVector(const T &initValue, size_t sz) {
    return vector<T>(sz, initValue);
}

template <class T, class... Args>
inline auto makeVector(const T &initValue, size_t sz, Args... args) {
    return vector<decltype(makeVector<T>(initValue, args...))>(sz, makeVector<T>(initValue, args...));
}

template <class Func>
class FixPoint : Func {
public:
    explicit constexpr FixPoint(Func&& f) noexcept : Func(forward<Func>(f)) {}

    template <class... Args>
    constexpr decltype(auto) operator()(Args&&... args) const {
        return Func::operator()(*this, std::forward<Args>(args)...);
    }
};

template <class Func>
static inline constexpr decltype(auto) makeFixPoint(Func&& f) noexcept {
    return FixPoint<Func>{forward<Func>(f)};
}

template <class Container>
struct reverse_t {
    Container &c;
    reverse_t(Container &c) : c(c) {}
    auto begin() { return c.rbegin(); }
    auto end() { return c.rend(); }
};

template <class Container>
auto reversed(Container &c) {
    return reverse_t<Container>(c);
}

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

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

template <class T>
inline T diff(const T &a, const T &b) noexcept {
    return a < b ? b - a : a - b;
}
// }}} End Header

constexpr int dy[] = {0, 1, 0, -1, -1, 1, 1, -1};
constexpr int dx[] = {1, 0, -1, 0, 1, 1, -1, -1};

const auto inside = [](int y, int x, int H, int W) -> bool {
    return (y >= 0 && x >= 0 && y < H && x < W);
};

void ioinit() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.setf(ios_base::fixed);
    cout.precision(10);
}

signed main() {
    ioinit();

    var(usize, H, W);
    var(int, sy, sx);
    var(int, gy, gx);
    sy--, sx--, gy--, gx--;

    vector<string> S(H);
    input(S);

    auto dp = makeVector<int>(INF, H, W);
    dp[sy][sx] = 0;
    deque<tuple<int, int, int>> que;
    que.emplace_back(0, sy, sx);

    const auto f = [&](int y, int x, int ny, int nx) -> bool {
        if (ny == y + dy[0] && nx == x + dx[0])
            return true;
        if (ny == y + dy[1] && nx == x + dx[1])
            return true;
        if (ny == y + dy[2] && nx == x + dx[2])
            return true;
        if (ny == y + dy[3] && nx == x + dx[3])
            return true;
        return false;
    };

    while (!que.empty()) {
        const auto [cnt, y, x] = que.front();
        que.pop_front();
        if (cnt > dp[y][x]) continue;
        reps(ny, y - 2, y + 2) reps(nx, x - 2, x + 2) {
            if (!inside(ny, nx, H, W)) continue;
            if (S[ny][nx] == '#') continue;
            if (f(y, x, ny, nx) && chmin(dp[ny][nx], dp[y][x])) {
                que.emplace_front(dp[ny][nx], ny, nx);
            } else if (chmin(dp[ny][nx], dp[y][x] + 1)) {
                que.emplace_back(dp[ny][nx], ny, nx);
            }
        }
    }

    output((dp[gy][gx] == INF) ? -1 : dp[gy][gx]);
    return 0;
}

Measured memory_bytes: 8696