#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int h, w;
vector<vector<int>> field;
vector<vector<int>> field_check;
vector<int> x;

void dfs(int y, int x){
    if (field_check[y][x])
        return;
    else{
        field_check[y][x] = 1;
        if (abs(field[y+1][x] - field[y][x]) <= 1)
            dfs(y+1, x);
        if (abs(field[y-1][x] - field[y][x]) <= 1)
            dfs(y-1, x);
        if (abs(field[y][x+1] - field[y][x]) <= 1)
            dfs(y, x+1);
        if (abs(field[y][x-1] - field[y][x]) <= 1)
            dfs(y, x-1);
        if (y < h && field[y+2][x] == field[y][x] && field[y+1][x] < field[y][x])
            dfs(y+2, x);
        if (y > 1 && field[y-2][x] == field[y][x] && field[y-1][x] < field[y][x])
            dfs(y-2, x);
        if (x < h && field[y][x+2] == field[y][x] && field[y][x+1] < field[y][x])
            dfs(y, x+2);
        if (x > 1 && field[y][x-2] == field[y][x] && field[y][x-1] < field[y][x])
            dfs(y, x-2);
        return;
    }
}

int main(){
    int sy, sx, gy, gx, counter;
    char k;
    cin >> h >> w;
    cin >> sy >> sx >> gy >> gx;
    for (int i = 0; i < h+2; i++){
        for (int i = 0; i < w + 2; i++)
            x.push_back(0);
        field_check.push_back(x);
        x.clear();
    }
        
    for (int i = 0; i < w + 2; i++)
        x.push_back(-2);
    field.push_back(x);
    x.clear();
    
    for (int i = 0; i < h; i++){
        x.push_back(-2);
        for (int j = 0; j < w; j++){
            cin >> k;
            x.push_back(k-48);
        }
        x.push_back(-2);
        field.push_back(x);
        x.clear();
    }

    for (int i = 0; i < w + 2; i++)
        x.push_back(-2);
    field.push_back(x);
    
    // for (auto v : field){
    //     for (auto w : v)
    //         cout << w;
    //     cout << endl;
    // }
    
    dfs(sy, sx);
    
    // for (auto v : field_check){
    //     for (auto w : v)
    //         cout << w;
    //     cout << endl;
    // }

    cout << ( field_check[gy][gx] ? "YES" : "NO" ) << endl;
    return 0;

}