#include <bits/stdc++.h>
using namespace std;
int n,m,n1,m1,x1,x2,y3,y2,ss = 9999999;
int x[10],y[10];
int a[50][50];
bool v[50][50];
void sou(int l,int r,int s){
    if(l == x2 && r == y2){
        if(ss > s)ss = s;
        return;
    }
    if(a[l][r] == 0 || l < 1 || r < 1 || l > m || r > n || v[l][r])return;
    v[l][r] = 1;
    for(int i = 1;i <= 8;i++){
        if(v[l+x[i]][r+y[i]] == 1)continue;
        sou(l+x[i],r+y[i],s+1);
    }
    v[l][r] = 0;
}
int main(){
    freopen("bronlily.in","r",stdin);
    freopen("bronlily.out","w",stdout);
    scanf("%d%d%d%d",&n,&m,&n1,&m1);
    x[1] = n1,x[2] = n1,x[3] = -n1,x[4] = -n1,x[5] = m1,x[6] = m1,x[7] = -m1,x[8] = -m1;
    y[1] = m1,y[2] = -m1,y[3] = m1,y[4] = -m1,y[5] = n1,y[6] = -n1,y[7] = n1,y[8] = -n1;
    for(int i = 1;i <= n;i++){
        for(int j = 1;j <= m;j++){
            scanf("%d",&a[i][j]);
            if(a[i][j] == 3)x1 = i,y3 = j;
            else if(a[i][j] == 4)x2 = i,y2 = j;
            else if(a[i][j] != 1)a[i][j] = 0;
        }
    }
    sou(x1,y3,0);
    printf("%d\n",ss);
    
    return 0;
    
}