#include <stdio.h>
#define INF 1000000000
#define MAXN 500
#define MAXK (7*MAXN*MAXN+1)
#define MAXD (3*MAXN*MAXN)
#define NRDIR 8
int dl[NRDIR]=
{
    -1, -1, 0, 1, 1, 1, 0, -1
};
int dc[NRDIR]=
{
    0, 1, 1, 1, 0, -1, -1, -1
};
int k;
int q[MAXN+2][MAXN+2], ok[MAXN+1][MAXN+1], d[MAXN+1][MAXN+1], r[MAXK+1], x[MAXK+1], y[MAXK+1], l[MAXD+1], s[MAXD+1], urm[MAXK+1];
inline int myabs(int a){
    if(a<0){
        return -a;
    }
    return a;
}
inline void adauga(int a, int b, int c, int o){
    k++;
    r[k]=o;
    x[k]=b;
    y[k]=c;
    d[b][c]=a;
    if(l[a]==0){
        l[a]=s[a]=k;
    }else{
        urm[s[a]]=k;
        s[a]=k;
    }
}
int main(){
    int n, m, x1, y1, x2, y2, i, j, t;
    FILE *fin, *fout;
    fin=fopen("car.in", "r");
    fout=fopen("car.out", "w");
    fscanf(fin, "%d%d%d%d%d%d", &n, &m, &x1, &y1, &x2, &y2);
    for(i=1; i<=n; i++){
        for(j=1; j<=m; j++){
            fscanf(fin, "%d", &q[i][j]);
            d[i][j]=INF;
        }
    }
    for(i=0; i<=n+1; i++){
        q[i][0]=q[i][m+1]=1;
    }
    for(i=0; i<=m+1; i++){
        q[0][i]=q[n+1][i]=1;
    }
    d[x1][y1]=0;
    for(i=0; i<NRDIR; i++){
        if(q[x1+dl[i]][y1+dc[i]]==0){
            adauga(0, x1+dl[i], y1+dc[i], i);
        }
    }
    t=0;
    while((t<d[x2][y2])&&(t<=MAXD)){
        while((t<=MAXD)&&(l[t]==0)){
            t++;
        }
        if(t<=MAXD){
            if(ok[x[l[t]]][y[l[t]]]==0){
                ok[x[l[t]]][y[l[t]]]=1;
                for(j=r[l[t]]-3; j<=r[l[t]]+3; j++){
                    i=(j+NRDIR)%NRDIR;
                    if((q[x[l[t]]+dl[i]][y[l[t]]+dc[i]]==0)&&(ok[x[l[t]]+dl[i]][y[l[t]]+dc[i]]==0)&&(d[x[l[t]]+dl[i]][y[l[t]]+dc[i]]>d[x[l[t]]][y[l[t]]]+myabs(r[l[t]]-j))){
                        adauga(d[x[l[t]]][y[l[t]]]+myabs(r[l[t]]-j), x[l[t]]+dl[i], y[l[t]]+dc[i], i);
                    }
                }
            }
            l[t]=urm[l[t]];
        }
    }
    if(d[x2][y2]==INF){
        d[x2][y2]=-1;
    }
    fprintf(fout, "%d\n", d[x2][y2]);
    fclose(fin);
    fclose(fout);
    return 0;
}