char c[102][102];
{
	ll@h,@w,@u,@d,@r,@l,@k,@p,@xs,@ys,@xt,@yt;
	rep(x,h)rd(c[x+1]+1);
	w+=2; h+=2;
	DijkstraHeap<ll>j;
	j.walloc(h*w,1);
	j.change(xs*w+ys,0);
	j.change(xt*w+yt,k+1);
	while(j.size){
		ll xy=j.pop(),x=xy/w,y=xy%w,v=j.val[xy],a;
		if(a=c[x-1][y],a=='.'||a=='@'){
			j.change((x-1)*w+y,v+u+p*(a=='@'));
		}
		if(a=c[x+1][y],a=='.'||a=='@'){
			j.change((x+1)*w+y,v+d+p*(a=='@'));
		}
		if(a=c[x][y-1],a=='.'||a=='@'){
			j.change(x*w+(y-1),v+l+p*(a=='@'));
		}
		if(a=c[x][y+1],a=='.'||a=='@'){
			j.change(x*w+(y+1),v+r+p*(a=='@'));
		}
	}
	ll v=j.val[xt*w+yt];
	wt("v=",v);
	wt(v>k?"No":"Yes");
}