#nullable enable

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

var t = I<int>();
var ans = new int[t];
for (var i = 0; i < t; i++)
{
    var n = I<int>();
    var c = 0;
    var f = -1;
    for (var j = 0; j <= 30; j++)
    {
        if (n.OfFlag(j)) c++;
        if (c >= 2 && !n.OfFlag(j) && f < 0) f = j;
    }
    if (c == 1) ans[i] = -1;
    else
    {
        var m = n.WithFlag(f, true);
        for (var j = 0; j < f; j++) m = m.WithFlag(j, false);
        ans[i] = m - n;
    }
}
Console.WriteLine(string.Join(Environment.NewLine, ans));

static class BitExtensions
{
    public static int ToFlag(this int i)
    {
        if (i < 0 || 31 <= i) throw new IndexOutOfRangeException();
        return 1 << i;
    }
    public static bool OfFlag(this int value, int i) => (value & ToFlag(i)) > 0;
    public static int WithFlag(this int value, int i, bool f) => f ? (value | ToFlag(i)) : (value & ~ToFlag(i));
}