#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

static T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();

var h = I<int>();
var w = I<int>();
var a = I<int>();
var b = I<int>();
var r1 = I<int>();
var c1 = I<int>();
var r2 = I<int>();
var c2 = I<int>();
var p = I<int>();
var q = I<int>();

var ans = int.MaxValue;
for (var i = 1; i <= h; i++) for (var j = 1; j <= w; j++)
{
    if (r1 <= i && i <= r2 && c1 <= j && j <= c2)
    {
        var d = Math.Abs(a - i) + Math.Abs(b - j) + Math.Abs(p - i) + Math.Abs(q - j);
        if (d < ans) ans = d;
    }
}
ans += Math.Abs(a - p) + Math.Abs(b - q);
Console.WriteLine(ans);