#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();

const int Max = int.MaxValue / 2;
var h = I<int>();
var w = I<int>();
var (sx, sy) = (I<int>(), I<int>());
var g = new bool[h + 2, w + 2];
for (var i = 0; i < h; i++)
{
    var row = I<string>();
    for (var j = 0; j < w; j++) g[i + 1, j + 1] = row[j] == '.';
}
var qz = Range(I<int>(), () => (I<int>(), I<int>(), I<int>()));

var dists1 = new int[h + 2, w + 2];
var dists2 = new int[h + 2, w + 2];
var dirs1 = new bool[h + 2, w + 2, 3, 3];
var dirs2 = new bool[h + 2, w + 2, 3, 3];
for (var i = 1; i <= h; i++) for (var j = 1; j <= w; j++) dists1[i, j] = dists2[i, j] = Max;
dists1[sx, sy] = 0;
var q = new Queue<(int, int, int)>();
q.Enqueue((sx, sy, 0));
while (q.Count > 0)
{
    var (qx, qy, qd) = q.Dequeue();
    if (qd > dists2[qx, qy]) continue;
    var nd = qd + 1;
    for (var dx = -1; dx <= 1; dx++) for (var dy = -1; dy <= 1; dy++)
    {
        if ((dx, dy) == (0, 0)) continue;
        var (x, y) = (qx, qy);
        while (true)
        {
            x += dx;
            y += dy;
            if (!g[x, y]) break;
            if (dists1[x, y] > nd)
            {
                dists1[x, y] = nd;
                q.Enqueue((x, y, nd));
                dirs1[x, y, dx + 1, dy + 1] = true;
            }
            else if (dists1[x, y] < nd && dists2[x, y] > nd)
            {
                dists2[x, y] = nd;
                q.Enqueue((x, y, nd));
                dirs2[x, y, dx + 1, dy + 1] = true;
            }
            else if (dists1[x, y] == nd && dirs1[x, y, dx + 1, dy + 1])
            {
                break;
            }
            else if (dists2[x, y] == nd && dirs2[x, y, dx + 1, dy + 1])
            {
                break;
            }
        }
    }
}
var ans = new List<string>();
foreach (var (x, y, t) in qz)
{
    var dq1 = dists1[x, y];
    var dq2 = dists2[x, y];
    if (t >= dq1 && (t - dq1) % 2 == 0 && ((x, y) != (sx, sy) || dq2 < Max)) ans.Add("Yes");
    else if (t >= dq2 && (t - dq2) % 2 == 0) ans.Add("Yes");
    else ans.Add("No");
}
Console.WriteLine(string.Join(Environment.NewLine, ans));