#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
   int h,w,a,b,r1,c1,r2,c2,p,q;
   cin >> h >> w >> a >> b >> r1 >> c1 >> r2 >> c2 >> p >> q;
   
   int ans = (1<<30);

   for(int i=r1;i<=r2;i++){
    for(int j=c1;j<=c2;j++){
        int stp1 = abs(a - i) + abs(b - j);
        int stp2 = abs(i - p) + abs(j - q);

        ans = min(ans,stp1 + stp2);
    }
   }

   cout << ans + abs(p - a) + abs(q - b) << endl;
}