#include<bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define pf push_front
#define eb emplace_back
#define emp emplace
#define ins insert
#define mp make_pair
#define mt make_tuple
#define sz(s) (int)s.size()
#define forp(i,a,b) for( int i=a;i<=b;i++)
#define rep(i,n)    for( int i=0;i<n;i++)
#define ren(i,n)    for( int i=n-1;i>=0;i--)
#define forn(i,a,b) for( int i=a;i>=b;i--)
#define w(t) while(t)
#define sc(a) scanf("%d", &a);
#define on cout<<"\n"
#define os cout <<" "
#define o2(a,b) cout<<a<<" "<<b
#define o(a) cout << a
#define ppr(a) cout << a.first << " " << a.second
#define bitcount __builtin_popcountll
#define gcd __gcd
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(), v.rend()
#define mem(n,m) memset(n,m,sizeof(n))
#define pii pair<int,int>
#define tiii tuple<int, int, int>
#define pll pair<long long,long long>
#define sii set<int>
#define sll set<long long>
#define vii vector<int>
#define vll vector<long long>
#define mii map<int,int>
#define mll map<long long, long long>
#define lob lower_bound
#define upb upper_bound
#define ret return
#define present(s,x) (s.find(x) != s.end())
#define cpresent(s,x) (find(all(s),x) != s.end())
#define ford(container, it) for(auto it = container.begin(); it != container.end(); it++)
#define fors(container, it, a, b) for(auto it = a; it != b; it++)
#define boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define MOD   1000000007
#define EPSILON 1e-9
#define PI acos(-1)
#define int long long
#define inf 1e16
#define debug(a) cerr<<#a<<": ";for(auto i:a)cerr<<i<<" ";cerr<<'\n';
#define trace(a) cerr<<#a<<": "<<a<<"\n"
//#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>


typedef long long  ll;
typedef long double  ldo;
typedef double  db ;
using namespace std;
auto start = std::chrono::system_clock::now();
inline void skj()
{
std::chrono::time_point<std::chrono::system_clock> end;
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
std::time_t end_time = std::chrono::system_clock::to_time_t(end);
cerr<<"Time taken " << elapsed_seconds.count()*1000<<"\n";
}

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//uniform_int_distribution<int> ud(1, 100); use this for random number generator
int csrand(int l=0, int r=1e9){
    uniform_int_distribution<int> uid(l, r);
    return uid(rng);
}
    //custom hash for unordered map
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
inline int binexp(int a,int b,int m)
{
    if(a == 0) {
        ret 0;
    }
    int res=1;
    a%=m;
    while(b)
    {
        if(b&1)
            res=(res*1ll*a)%m;
        a=(a*1ll*a)%m;
        b>>=1;
    }
    return res;
}
inline int binmul(int a, int b, int m) {
    a %= m;
    int res = 0;
    w(b) {
        if(b & 1) {
            res = (res + a) % m;
        }
        a = (a + a) % m;
        b >>= 1;
    }
    ret res;
}
void solve() {
    int n, m;
    cin >> n >> m;
    int sx, sy, dx, dy;
    cin >> sx >> sy >> dx >> dy;
    sx--, sy--, dx--, dy--;
    vector<string> grid(n);
    for(int i = 0; i < n; ++i) {
        cin >> grid[i];
    }
    deque<pair<int, int> > q;
    vector<vector<int>> dis(n, vector<int> (m, inf));
    dis[sx][sy] = 0;
    vector<vector<bool>> visited(n, vector<bool> (m, false));
    q.push_back({sx, sy});
    while(q.size()) {
        auto u = q.front();
        q.pop_front();
       // cout << u.first << " " << u.second << "\n";
        if(grid[u.first][u.second] == '#' || visited[u.first][u.second]) {
            continue;
        }
        if(u.first == dx && u.second == dy) {
            cout << dis[dx][dy] << "\n";
            return;
        }
        visited[u.first][u.second] = true;
        for(int moveX = -1; moveX <= 1; moveX++) {
            for(int moveY = -1; moveY <= 1; moveY++) {
                if(moveX == moveY) continue;
                if(moveX != 0 && moveY != 0) continue;
                if(moveX + u.first < n && moveX + u.first >= 0 && moveY + u.second < m && moveY + u.second >= 0
                    && visited[moveX + u.first][moveY + u.second] == false) {
                    q.push_front({moveX + u.first, moveY + u.second});
                    dis[moveX + u.first][moveY + u.second] = min(dis[moveX + u.first][moveY + u.second],
                    dis[u.first][u.second]);
                   
                }
            }
        }
        for(int moveX = -2; moveX <= 2; moveX++) {
            for(int moveY = -2; moveY <= 2; moveY++) {
                if(moveX + u.first < n && moveX + u.first >= 0 && moveY + u.second < m && moveY + u.second >= 0
                    && visited[moveX + u.first][moveY + u.second] == false) {
                    q.push_back({moveX + u.first, moveY + u.second});
                    
                    dis[moveX + u.first][moveY + u.second] = min(dis[moveX + u.first][moveY + u.second], 
                                                1 + dis[u.first][u.second]);
                    
                }
            }
        }
    }
    cout << "-1\n";
}
int32_t main()
{
    boost
    int t = 1;
    //cin >> t;
    int a = 1;
    while(t--) {
      //  cout << "Case #" << a  << ": \n";
        solve();
        a++;
    }
    //skj();
    return 0;
}

Measured memory_bytes: 15696