#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char rbuf[1<<20];

#define rd(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {long _z=v;do*--wp=_z%10+48;while(_z/=10);}

char v[1001][1001][6];
int q[6000000];

main(){
	read(0,rbuf,sizeof rbuf);
	char*rp=rbuf;
	rd(h); rd(w);
	rd(sy); rd(sx);
	rd(gy); rd(gx);

	++w;

	long r=0;
	long qr=0,qw=0;
	q[qw++]=0|sx<<3|sy<<13;
	while(qr<qw){
		long qn=qw;
		while(qr<qn){
			long d=q[qr]&7;
			long x=q[qr]>>3&1023;
			long y=q[qr]>>13;
			++qr;
			if(y==gy&&x==gx&&d==0){
				char wbuf[64],*wp=wbuf+sizeof wbuf;
				wt(r);
				write(1,wp,wbuf+sizeof wbuf-wp);
				_exit(0);
			}
			// y+1
			if(rp[(y-0)*w+(x-1)]=='.'){
				long d2="\1\5\2\0\4\3"[d];
				if(!v[y+1][x][d2]){
					v[y+1][x][d2]=1;
					q[qw++]=d2|x<<3|y+1<<13;
				}
			}
			// x+1
			if(rp[(y-1)*w+(x-0)]=='.'){
				long d2="\2\1\5\3\0\4"[d];
				if(!v[y][x+1][d2]){
					v[y][x+1][d2]=1;
					q[qw++]=d2|x+1<<3|y<<13;
				}
			}
			// y-1
			if(rp[(y-2)*w+(x-1)]=='.'){
				long d2="\3\0\2\5\4\1"[d];
				if(!v[y-1][x][d2]){
					v[y-1][x][d2]=1;
					q[qw++]=d2|x<<3|y-1<<13;
				}
			}
			// x-1
			if(rp[(y-1)*w+(x-2)]=='.'){
				long d2="\4\1\0\3\5\2"[d];
				if(!v[y][x-1][d2]){
					v[y][x-1][d2]=1;
					q[qw++]=d2|x-1<<3|y<<13;
				}
			}
		}
		++r;
	}
	write(1,"-1",2);
	_exit(0);
}