read h w
read {a..d}
mapfile s
n=1
Q=({a,b}-1)
R=Q[--N]
for((N=2;N;)){
for((q=R,p=R;a=p,b=q,(p|q)>=0&&z[p*64+q]++<4;t=u*u<2?1:u<0|v?0:2,Q[N++]=p+n*t,Q[N++]=q+m*t,t=n,n=m,m=-t)){
eval {t=,{u,v}=t-}'1${s[a]:b:a+=n,b+=m,1}'
}
}
NO
echo ${_[z[c*64+d-65]]-YES}