package contest200401;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Queue;

public class G {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni(), m = ni();
		int sr = ni()-1, sc = ni()-1;
		int gr = ni()-1, gc = ni()-1;
		char[][] map = nm(n, m);
		char[][] xmap = new char[n+2][m+2];
		for(int i = 0;i < n+2;i++) {
			Arrays.fill(xmap[i], '#');
		}
		sr++; sc++; gr++; gc++;
		for(int i = 0;i < n;i++) {
			for(int j = 0;j < m;j++) {
				xmap[i+1][j+1] = map[i][j];
			}
		}
		int[][] d = distMap(xmap, sr, sc);
		out.println(d[gr][gc]);
	}
	
	public static int[][] distMap(char[][] map, int sr, int sc)
	{
		int[] dr = { 1, 0, -1, 0 };
		int[] dc = { 0, 1, 0, -1 };
		int n = map.length;
		if(n == 0)return new int[0][0];
		int m = map[0].length;
		int l = dr.length;
		int[][] d = new int[n][m];
		int I = 999999999;
		for(int i = 0;i < n;i++) {
			Arrays.fill(d[i], 999999999);
		}
		
		int B = Integer.numberOfTrailingZeros(Integer.highestOneBit(m))+1;
		Queue<Integer> q = new ArrayDeque<Integer>();
		q.add(sr<<B|sc);
		d[sr][sc] = 0;
		
		while(!q.isEmpty()){
			int cur = q.poll();
			int r = cur>>>B, c = cur&(1<<B)-1;
			for(int k = 0;k < l;k++) {
				int nr = r + dr[k];
				int nc = c + dc[k];
				if(nr >= 0 && nr < n && nc >= 0 && nc < m && map[nr][nc] == '.' && d[nr][nc] == I) { // fix
					d[nr][nc] = d[r][c] + 1;
					q.add(nr<<B|nc);
				}
			}
		}
		return d;
	}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new G().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}