#include <bits/stdc++.h>

using namespace std;
using ull = unsigned long long;
using ll = long long;
using lli = long long int;
using ld = long double;
using pa = pair<int, int>;
using ppa = pair<pa, int>;
#define SORT(v, n) sort(v, v + n);
#define ALL(v) v.begin(), v.end()
#define VSORT(v) sort(ALL(v))
#define GRESORT(v) sort(ALL(v), greater<ll>())
#define REVERSE(v) reverse(ALL(v))
#define overlap(v) v.erase(unique(ALL(v)), v.end())
#define debug(x) cout << #x << ": " << x << endl
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define rep(i, n) FOR(i, 0, n)
#define RFOR(i, a, b) for (int i = (b - 1); i >= a; i--)
#define rrep(i, n) RFOR(i, 0, n)
#define INF INT_MAX
#define SUP INT_MIN
#define mins(a, b) a = min(a, b)
#define maxs(a, b) a = max(a, b)

// 4近傍
int dy[]={0, 1, 0, -1};
int dx[]={1, 0, -1, 0};

// 8近傍
// int dy[]={0,0,1,-1,1,1,-1,-1};
// int dx[]={1,-1,0,0,1,-1,1,-1};

// const ll MOD = 1000000007;

ll pow_mod(ll a, ll b, ll mod) {
    ll tmp = 1;
    a %= mod;
    if (b > 0) {
        tmp = pow_mod(a, b / 2, mod);
        if (b % 2)
            tmp = (((tmp * tmp) % mod) * a) % mod;
        else
            tmp = (tmp * tmp) % mod;
    }
    return tmp;
}

void solve() {
    int h,w; cin >> h >> w;
    int sx,sy,gx,gy; cin >> sy >> sx >> gy >> gx;
    sx--; sy--; gx--; gy--;
    vector<vector<bool>> d(h,vector<bool>(w,false));
    vector<string> s(h); rep(i,h) cin >> s[i];
    queue<pa> q;
    q.push(pa(sx,sy));
    d[sy][sx] = true;
    while(!q.empty()){
        pa p = q.front(); q.pop();
        int x = p.first, y = p.second;
        if(x == gx && y == gy) break;
        rep(i,4){
            int xx = x + dx[i];
            int yy = y + dy[i];
            if(xx < 0 || yy < 0 || xx >= w || yy >= h) continue;
            if(abs(s[yy][xx] - s[y][x]) <= 1 && d[yy][xx] == false){
                q.push(pa(xx,yy));
                d[yy][xx] = true;
            }
            if(s[y][x] > s[yy][xx]){
                xx += dx[i];
                yy += dy[i];
                if(xx < 0 || yy < 0 || xx >= w || yy >= h) continue;
                if(s[y][x] == s[yy][xx] && d[yy][xx] == false){
                    q.push(pa(xx,yy));
                    d[yy][xx] = true;
                }
            }
        }
    }
    cout << (d[gy][gx] ? "YES" : "NO") << endl;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);

    solve();

    return 0;
}