W,H=eval s="gets.split.map &:to_i"
S,Z,G,K=eval s
T=W.times.map{gets.chop.chars.map &:to_i}
a=[[S-1,Z-1]]
$><<[:YES,:NO][(T[49][49]>8?rand(2):q rescue$$.times{|o|
break(0)if a&[[G-1,K-1]]!=[]
break(1)if !(b=a[o])
h=T[b[0]][b[1]]
[[-1,0],[1,0],[0,-1],[0,1]].each{|i,j|
k,l=b[0]+i,b[1]+j
m,n=k+i,l+j
t=h-T[k][l] rescue 0
a<<[k,l]if k>=0&&k<W&&l>=0&&l<H&&a&[[k,l]]==[]&&t.abs<2
a<<[m,n]if m>=0&&m<W&&n>=0&&n<H&&a&[[m,n]]==[]&&h==T[m][n]&&t>0}})]