#include<bits/stdc++.h>
using namespace std;

#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

#define mygc(c) (c)=getchar_unlocked()
#define mypc(c) putchar_unlocked(c)

#define ll long long
#define ull unsigned ll

void reader(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(ll *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
void reader(double *x){scanf("%lf",x);}
int reader(char c[]){int i,s=0;for(;;){mygc(i);if(i!=' '&&i!='\n'&&i!='\r'&&i!='\t'&&i!=EOF) break;}c[s++]=i;for(;;){mygc(i);if(i==' '||i=='\n'||i=='\r'||i=='\t'||i==EOF) break;c[s++]=i;}c[s]='\0';return s;}
template <class T, class S> void reader(T *x, S *y){reader(x);reader(y);}
template <class T, class S, class U> void reader(T *x, S *y, U *z){reader(x);reader(y);reader(z);}
template <class T, class S, class U, class V> void reader(T *x, S *y, U *z, V *w){reader(x);reader(y);reader(z);reader(w);}

void writer(int x, char c){int s=0,m=0;char f[10];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(ll x, char c){int s=0,m=0;char f[20];if(x<0)m=1,x=-x;while(x)f[s++]=x%10,x/=10;if(!s)f[s++]=0;if(m)mypc('-');while(s--)mypc(f[s]+'0');mypc(c);}
void writer(double x, char c){printf("%.15f",x);mypc(c);}
void writer(const char c[]){int i;for(i=0;c[i]!='\0';i++)mypc(c[i]);}
void writer(const char x[], char c){int i;for(i=0;x[i]!='\0';i++)mypc(x[i]);mypc(c);}
template<class T> void writerLn(T x){writer(x,'\n');}
template<class T, class S> void writerLn(T x, S y){writer(x,' ');writer(y,'\n');}
template<class T, class S, class U> void writerLn(T x, S y, U z){writer(x,' ');writer(y,' ');writer(z,'\n');}
template<class T> void writerArr(T x[], int n){int i;if(!n){mypc('\n');return;}rep(i,n-1)writer(x[i],' ');writer(x[n-1],'\n');}

char memarr[17000000]; void *mem = memarr;
#define MD 1000000007

struct dimensionCompress2 {
  int B;
  void set(int b){B=b;}
  void set(int a, int b){B=b;}
  int mask(int a, int b){return a*B+b;}
  void para(int mask, int *a, int *b){*a=mask/B;*b=mask%B;}
};

struct dimensionCompress3 {
  int B, C;
  void set(int b, int c){B=b;C=c;}
  void set(int a, int b, int c){B=b;C=c;}
  int mask(int a, int b, int c){return(a*B+b)*C+c;}
  void para(int mask, int *a, int *b, int *c){*a=mask/(B*C);*b=mask%(B*C)/C;*c=mask%C;}
};

struct dimensionCompress4 {
  int B, C, D;
  void set(int b, int c, int d){B=b;C=c;D=d;}
  void set(int a, int b, int c, int d){B=b;C=c;D=d;}
  int mask(int a, int b, int c, int d){return((a*B+b)*C+c)*D+d;}
  void para(int mask, int *a, int *b, int *c, int *d){*a=mask/(B*C*D);*b=mask%(B*C*D)/(C*D);*c=mask%(C*D)/D;*d=mask%D;}
};

struct dimensionCompress5 {
  int B, C, D, E;
  void set(int b, int c, int d, int e){B=b;C=c;D=d;E=e;}
  void set(int a, int b, int c, int d, int e){B=b;C=c;D=d;E=e;}
  int mask(int a, int b, int c, int d, int e){return(((a*B+b)*C+c)*D+d)*E+e;}
  void para(int mask, int *a, int *b, int *c, int *d, int *e){*a=mask/(B*C*D*E);*b=mask%(B*C*D*E)/(C*D*E);*c=mask%(C*D*E)/(D*E);*d=mask%(D*E)/E;*e=mask%E;}
};


int X, Y;
int A, Sx, Sy;
int B, Gx, Gy;
char mp[100][100];

int vis[4500000], st[4500000], sts;

int main(){
  int i, j, k, mask, smask;
  int x, y, s, nx, ny, ns, d;
  int dx[4] = {-1,1,0,0}, dy[4] = {0,0,-1,1};
  dimensionCompress3 dim;

  reader(&X,&Y);
  reader(&A,&Sx,&Sy);
  reader(&B,&Gx,&Gy);
  rep(i,X) reader(mp[i]);

  dim.set(X, Y, 1800);

//  k = B-A+Gx-Sa+Gy-Sy;
//  if(k%2){ writerLn("No"); return 0; }

  sts = 0;
  mask = dim.mask(Sx,Sy,A);
  vis[mask] = 1;
  st[sts++] = mask;

  while(sts){
    mask = st[--sts];
    dim.para(mask, &x, &y, &s);
    if(x==Gx && y==Gy && s==B){
      writerLn("Yes");
      return 0;
    }
    rep(d,4){
      nx = x + dx[d];
      ny = y + dy[d];
      if(nx < 0 || ny < 0 || nx >= X || ny >= Y) continue;
      if(mp[nx][ny]=='.') ns = s-1; else ns = s+1;
      if(ns <= 0 || ns >= 1800) continue;
      smask = dim.mask(nx, ny, ns);
      if(!vis[smask]) vis[smask] = 1, st[sts++] = smask;
    }
  }

  writerLn("No");

  return 0;
}