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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int H, W, A, B, R1, C1, R2, C2, P, Q, ans = INT_MAX;
    cin >> H >> W >> A >> B >> R1 >> C1 >> R2 >> C2 >> P >> Q;
    vector<pair<int, int>> dir = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
    auto dist = [&](int nr, int nc, int tr, int tc) -> int {
        return abs(nr - tr) + abs(nc - tc);
    };
    for(int r=R1; r<=R2; r++) for(int c=C1; c<=C2; c++) ans = min(ans, dist(A, B, r, c) + dist(r, c, P, Q) + dist(P, Q, A, B));
    cout << ans << endl;
}