import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Deque;
import java.util.Iterator;


public class Main_yukicoder323_1 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Printer pr = new Printer(System.out);

        int h = sc.nextInt();
        int w = sc.nextInt();
        int a = sc.nextInt();
        int si = sc.nextInt();
        int sj = sc.nextInt();
        int b = sc.nextInt();
        int gi = sc.nextInt();
        int gj = sc.nextInt();

        char[][] akichi = new char[h][];
        for (int i = 0; i < h; i++) {
        	akichi[i] = sc.next().toCharArray();
        }

        if (Math.abs(a - b) % 2 != Math.abs(si - gi + sj - gj) % 2) {
        	pr.println("No");

        	sc.close();
        	pr.close();
        	return;
        }

        int[] di = {-1, 0, 1, 0};
        int[] dj = {0, 1, 0, -1};
        int max = Math.max(a, b) + h * w;
        boolean[][][] used = new boolean[h][w][max + 1];

        Deque<Integer> qi = new ArrayDeque<Integer>();
        Deque<Integer> qj = new ArrayDeque<Integer>();
        Deque<Integer> qs = new ArrayDeque<Integer>();
        qi.add(si);
        qj.add(sj);
        qs.add(a);
        used[si][sj][a] = true;
        while (!qi.isEmpty()) {
        	int i = qi.remove();
        	int j = qj.remove();
        	int size = qs.remove();
        	for (int k = 0; k < di.length; k++) {
    			int ni = i + di[k];
    			int nj = j + dj[k];
    			if (ni < 0 || ni >= h || nj < 0 || nj >= w) {
    				continue;
    			}

    			int nyuki;
				if (akichi[ni][nj] == '*') {
					nyuki = size + 1;
				} else {
					nyuki = size - 1;
				}
				if (nyuki == 0) {
					continue;
				}

    			if (nyuki > max || used[ni][nj][nyuki]) {
    				continue;
    			}

    			used[ni][nj][nyuki] = true;
    			qi.add(ni);
    			qj.add(nj);
    			qs.add(nyuki);
        	}
        }

        if (used[gi][gj][b]) {
        	pr.println("Yes");
        } else {
        	pr.println("No");
        }

        pr.close();
        sc.close();
    }

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;
		Iterator<String> it;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		String next() throws RuntimeException  {
			try {
				if (it == null || !it.hasNext()) {
					it = Arrays.asList(br.readLine().split(" ")).iterator();
				}
				return it.next();
			} catch (IOException e) {
				throw new IllegalStateException();
			}
		}

		int nextInt() throws RuntimeException {
			return Integer.parseInt(next());
		}

		long nextLong() throws RuntimeException {
			return Long.parseLong(next());
		}

		float nextFloat() throws RuntimeException {
			return Float.parseFloat(next());
		}

		double nextDouble() throws RuntimeException {
			return Double.parseDouble(next());
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new IllegalStateException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}