import java.io.DataInputStream; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Scanner; 
import java.util.StringTokenizer; 
import java.io.BufferedReader; 
import java.util.*;
import java.math.BigInteger; 


public class Main{
	public static FastReader fs = new FastReader();
	static int h,w,sx,sy,ex,ey;
	static char grid [][];
	static PrintWriter out = new PrintWriter(System.out);
	
	static boolean possible(int x,int y) {
		return (x >= 0 && y>= 0 && x<h && y<w && grid[x][y] == '.');
	}
	
	static class node implements Comparable<node>{
		int row,col,distance;
		node(int r,int c,int d){
			this.row = r;
			this.col = c;
			this.distance = d;
		}
		public int compareTo(node n) {
			return Integer.compare(distance, n.distance);
		}
	}
	
	static void solve() {
		h = fs.nextInt();w = fs.nextInt();
		sx = fs.nextInt()-1;sy = fs.nextInt()-1;
		ex = fs.nextInt()-1;ey = fs.nextInt()-1;
		grid = new char [h][w];
		for(int i = 0; i<h; i++) {
			char line [] = fs.next().toCharArray();
			for(int j = 0; j<w; j++) {
				grid[i][j] = line[j];
			}
		}
		PriorityQueue<node> pq = new PriorityQueue<>();
		int dist [][] = new int [h][w];
		for(int i = 0; i<h; i++)
			Arrays.fill(dist[i], 1_000_000_000);
		dist[sx][sy] = 0;
		pq.add(new node(sx,sy,0));
		while(!pq.isEmpty()) {
			node n = pq.remove();
			if(n.row == ex && n.col == ey) {
				out.println(n.distance);
				return;
			}
			if(possible(n.row+1,n.col) && dist[n.row+1][n.col] > n.distance) {
				dist[n.row+1][n.col] = n.distance;
				pq.add(new node(n.row+1,n.col,n.distance));
			}
			if(possible(n.row-1,n.col) && dist[n.row-1][n.col] > n.distance) {
				dist[n.row-1][n.col] = n.distance;
				pq.add(new node(n.row-1,n.col,n.distance));
			}
			if(possible(n.row,n.col+1) && dist[n.row][n.col+1] > n.distance) {
				dist[n.row][n.col+1] = n.distance;
				pq.add(new node(n.row,n.col+1,n.distance));
			}
			if(possible(n.row,n.col-1) && dist[n.row][n.col-1] > n.distance) {
				dist[n.row][n.col-1] = n.distance;
				pq.add(new node(n.row,n.col-1,n.distance));
			}
			
			for(int i = n.row-2; i <= n.row+2; i++) {
				for(int j = n.col-2; j <= n.col+2; j++) {
					if(possible(i,j) && dist[i][j] > n.distance+1){
						dist[i][j] = n.distance+1;
						pq.add(new node(i,j,n.distance+1));
					}
				}
			}
		}
		out.println(-1);
	}
	
	public static void main(String[] args) {
		Thread t = new Thread(null,null,"",1 << 28) {
			public void run() {
				int test_case = 1;
				//test_case = fs.nextInt();
				for(int cs = 1; cs <= test_case; cs++) {
					solve();
				}
				out.close();
			}
		};
		t.start();
		try {
			t.join();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
        
        int [] readintarray(int n) {
        	int res [] = new int [n];
        	for(int i = 0; i<n; i++)res[i] = nextInt();
        	return res;
        }
        long [] readlongarray(int n) {
        	long res [] = new long [n];
        	for(int i = 0; i<n; i++)res[i] = nextLong();
        	return res;
        }
    } 
	
	static int ceil(int x,int y) {
		return (x % y == 0 ? x / y : (x / y +1));
	}
	
	static long ceil(long x,long y) {
		return (x % y == 0 ? x / y : (x / y +1));
	}
	
	static int max(int x,int y) {
		return Math.max(x, y);
	}
	
	static int min(int x,int y) {
		return Math.min(x, y);
	}
	
	static long max(long x,long y) {
		return Math.max(x, y);
	}
	
	static long min(long x,long y) {
		return Math.min(x, y);
	}
	
	static int min(int a []) {
		int x = 1_000_000_00_9;
		for(int i = 0; i<a.length; i++)x = min(x,a[i]);
		return x;
	}
	
	static int max(int a []) {
		int x = -1_000_000_00_9;
		for(int i = 0; i<a.length; i++)x = max(x,a[i]);
		return x;
	}
	
	static long min(long a []) {
		long x = (long)3e18;
		for(int i = 0; i<a.length; i++)x = min(x,a[i]);
		return x;
	}
	
	static long max(long a []) {
		long x = -(long)3e18;
		for(int i = 0; i<a.length; i++)x = max(x,a[i]);
		return x;
	}
	
	static int power(int x,int y) {
		int res = 1;
		while(y > 0) {
			if( y % 2 == 1)res = (res * x);
			y >>= 1;
            x = (x * x);
		}
		return res;
	}
	
	static long power(long x,long y) {
		long res = 1;
		while(y > 0) {
			if( y % 2 == 1)res = (res * x);
			y >>= 1;
            x = (x * x);
		}
		return res;
	}
	
	static long power(long x,long y,long mod) {
		long res = 1;
		x %= mod;
		while(y > 0) {
			if( y % 2 == 1)res = (res * x) % mod;
			y >>= 1;
            x = (x * x) % mod;
		}
		return res;
	}
	
	static void intsort(int [] a) {
		List<Integer> temp = new ArrayList<Integer>();
		for(int i = 0; i<a.length; i++)temp.add(a[i]);
		Collections.sort(temp);
		for(int i = 0; i<a.length; i++)a[i] = temp.get(i);
	}
	
	static void longsort(long [] a) {
		List<Long> temp = new ArrayList<Long>();
		for(int i = 0; i<a.length; i++)temp.add(a[i]);
		Collections.sort(temp);
		for(int i = 0; i<a.length; i++)a[i] = temp.get(i);
	}
	
	static void reverseintsort(int [] a) {
		List<Integer> temp = new ArrayList<Integer>();
		for(int i = 0; i<a.length; i++)temp.add(a[i]);
		Collections.sort(temp);
		Collections.reverse(temp);
		for(int i = 0; i<a.length; i++)a[i] = temp.get(i);
	}
	
	static void reverselongsort(long [] a) {
		List<Long> temp = new ArrayList<Long>();
		for(int i = 0; i<a.length; i++)temp.add(a[i]);
		Collections.sort(temp);
		Collections.reverse(temp);
		for(int i = 0; i<a.length; i++)a[i] = temp.get(i);
	}
	
	
	static void intervalsort(int a [],int start,int end) {
		ArrayList<Integer> temp = new ArrayList<>();
		for(int i = start; i<end; i++)
			temp.add(a[i]);
		Collections.sort(temp);
		for(int i = 0; i<temp.size(); i++)
			a[i+start] = temp.get(i);
	}
	
	static void intervalsort(long a [],int start,int end) {
		ArrayList<Long> temp = new ArrayList<>();
		for(int i = start; i<end; i++)
			temp.add(a[i]);
		Collections.sort(temp);
		for(int i = 0; i<temp.size(); i++)
			a[i+start] = temp.get(i);
	}
	
	static void reverseintervalsort(int a [],int start,int end) {
		ArrayList<Integer> temp = new ArrayList<>();
		for(int i = start; i<end; i++)
			temp.add(a[i]);
		Collections.sort(temp);
		Collections.reverse(temp);
		for(int i = 0; i<temp.size(); i++)
			a[i+start] = temp.get(i);
	}
	
	static void reverseintervalsort(long a [],int start,int end) {
		ArrayList<Long> temp = new ArrayList<>();
		for(int i = start; i<end; i++)
			temp.add(a[i]);
		Collections.sort(temp);
		Collections.reverse(temp);
		for(int i = 0; i<temp.size(); i++)
			a[i+start] = temp.get(i);
	}
	
	
	static class data{
		public long sum;
		
		data(long val){
		    this.sum = val;
		}
		
		data(){}
		
		data combine(data l, data r) {
		    data res = new data();
		    res.sum = l.sum + r.sum;
		    return res;
		}
	}
	
	static class Seg_Tree extends data{
		public int n;
		data [] seg;
		
		Seg_Tree(int sz){
			this.n = sz;
			seg = new data[4*n+4];
		}
		
		void build(long a[], int v, int tl, int tr) {
		    if (tl == tr) {
		        seg[v] = new data(a[tl]);
		    } else {
		        int tm = (tl + tr) / 2;
		        build(a, v*2, tl, tm);
		        build(a, v*2+1, tm+1, tr);
		        seg[v] = combine(seg[v*2],seg[v*2+1]);
		    }
		}

		void update(int v, int tl, int tr, int pos, long new_val) {
		    if (tl == tr) {
		        seg[v] = new data(new_val);
		    } else {
		        int tm = (tl + tr) / 2;
		        if (pos <= tm)
		            update(v*2, tl, tm, pos, new_val);
		        else
		            update(v*2+1, tm+1, tr, pos, new_val);
		        seg[v] = combine(seg[v*2],seg[v*2+1]);
		    }
		}
		
		data query(int v, int tl, int tr, int l, int r) {
		    if (l > r) 
		        return new data(0);
		    if (l == tl && r == tr) 
		        return seg[v];
		    int tm = (tl + tr) / 2;
		    return combine(query(v*2, tl, tm, l, min(r, tm)),query(v*2+1, tm+1, tr, max(l, tm+1), r));
		}
	}
	
	static class Bit_Tree{
		static int n;
		static int [] bit;
		
		Bit_Tree(int sz){
			Bit_Tree.n = sz;
			Bit_Tree.bit = new int[n+1];
		}
		
		static int child(int x) {
			return x + (x & (-x));
		}
		
		static int parent(int x) {
			return x - (x & (-x));
		}
		
		static void build(int [] a) {
			for(int i = 0; i<a.length; i++) {
				int start = i+1;
				while(start <= n) {
					bit[start] += a[i];
					start = child(start);
				}
			}
		}
		
		static void update(int idx,int new_val) {
			idx += 1;
			while(idx <= n) {
				bit[idx] += new_val;
				idx = child(idx);
			}
		}
		
		static int query(int right) {
			int res = 0;
			while(right > 0) {
				res += bit[right];
				right = parent(right);
			}
			return res;
		}
		
		static int query(int left,int right) {
			return query(right) - query(left-1);
		}
	}
	
	public static int gcd(int a, int b)  
    { 
        BigInteger b1 = BigInteger.valueOf(a); 
        BigInteger b2 = BigInteger.valueOf(b); 
        BigInteger gcd = b1.gcd(b2); 
            return gcd.intValue(); 
    } 
      
    public static long gcd(long a, long b)  
    { 
        BigInteger b1 = BigInteger.valueOf(a); 
        BigInteger b2 = BigInteger.valueOf(b); 
        BigInteger gcd = b1.gcd(b2); 
            return gcd.longValue(); 
    } 
}

Measured memory_bytes: 54672