#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<long double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

int h,w,sx,sy,gx,gy;
vvi a,b;

bool dfs(int x,int y){
	if(b[x][y]) return 0;
	b[x][y]=1;
	if(x==gx&y==gy) return 1;
	bool B=0;
	for(int k=0;k<4;k++){
		int cx=x+dx[k],cy=y+dy[k];
		if(abs(a[x][y]-a[cx][cy])<2) B|=dfs(cx,cy);
		if(a[cx][cy]<a[x][y]){
			cx+=dx[k],cy+=dy[k];
			if(a[x][y]==a[cx][cy]) B|=dfs(cx,cy);
		}
	}
	return B;
}

int main(){
	cin>>h>>w>>sx>>sy>>gx>>gy;
	a=vvi(h+2,vi(w+2,inf));
	b=vvi(h+2,vi(w+2));
	for(int i=1;i<=h;i++) for(int j=1;j<=w;j++){
		char c;
		cin>>c;
		a[i][j]=c-'0';
	}
	cout<<(dfs(sx,sy)?"YES":"NO")<<endl;
}