#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*1002][6];
int q[6000000];

main(){
	char*rp=rbuf+4096;
	read(0,rp,rp-rbuf+sizeof rbuf);
	rd(h); rd(w);
	rd(sy); rd(sx);
	rd(gy); rd(gx);

	++w;
	sx=(sx-1)+(sy-1)*w;
	gx=(gx-1)+(gy-1)*w;

	long r=0;
	long qr=0,qw=0;
	q[qw++]=0|sx<<3;
	while(qr<qw){
		long qn=qw;
		while(qr<qn){
			long d=q[qr]&7;
			long x=q[qr]>>3;
			++qr;
			if(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[x+w]=='.'){
				long d2="\1\5\2\0\4\3"[d];
				if(!v[x+w][d2]){
					v[x+w][d2]=1;
					q[qw++]=d2|x+w<<3;
				}
			}
			// x+1
			if(rp[x+1]=='.'){
				long d2="\2\1\5\3\0\4"[d];
				if(!v[x+1][d2]){
					v[x+1][d2]=1;
					q[qw++]=d2|x+1<<3;
				}
			}
			// x-1
			if(rp[x-1]=='.'){
				long d2="\4\1\0\3\5\2"[d];
				if(!v[x-1][d2]){
					v[x-1][d2]=1;
					q[qw++]=d2|x-1<<3;
				}
			}
			// y-1
			if(rp[x-w]=='.'){
				long d2="\3\0\2\5\4\1"[d];
				if(!v[x-w][d2]){
					v[x-w][d2]=1;
					q[qw++]=d2|x-w<<3;
				}
			}
		}
		++r;
	}
	write(1,"-1",2);
	_exit(0);
}