Note: This problem shares similarities with Chapter 1. The solution to either chapter may help with solving the other, so please consider reading both first.

When not out fighting crime, Shaun works valet at the Fairmont hotel. Recently, he has been using his new weapon – the ten rings – to secretly help him park cars among (T) valet-designated garages.

The layout of a garage is a grid (G) of (R) rows (numbered from (1) to (R) from top to bottom) and (C) columns (numbered from (1) to (C) from left to right) of parking spaces. Initially, each space in row (i) and column (j) contains a car if (G_{i,j} =) "X", or is otherwise empty (if (G_{i,j} =) ".").

Shaun's friend, Master sorcerer Wong, has been interfering on his shift today. Wong will cast a sequence of (S) spells, numbered from (1) to (S). The (i)th spell will change whether the space at row (A_i) and column (B_i) contains a car. If that space is empty, Wong will open a portal and teleport a car into the space, whereas if the space already contains a car, Wong will teleport the car away, leaving an empty space.

After each spell, Shaun would like to consider the task of clearing out a path for easy garage access, requiring cars to be rearranged such that a certain row (K) contains no cars in any of its (C) spaces. To that end, the magic of the ten rings supports the following (3) types of moves:

Levitate any car out of the garage and onto the street, leaving its space empty (and the position of all other cars unchanged).
Shift all the cars in the garage upwards. For each car in the garage, it moves from its current parking space to the space just above it, unless there's either no such space (due to the car being in row (1)) or that space is occupied by a car which is remaining stationary, in which case this car itself remains stationary.
Shift all the cars in the garage downwards (similarly to #2).

For example, a sequence of two moves of type #2 is illustrated below:

  X..   XXX   XXX
  .XX   ..X   XXX
  ..X   XXX   ..X
  XXX   ...   ...

Note that while Shaun must strategize a sequence of moves after each spell, he never carries them out (leaving only Wong's spells to make actual changes to the garage).

Let (M_i) be the minimum number of moves which would theoretically be required to leave row (K) empty starting from the state of the garage after the first (i) spells have been cast. Please help Shaun compute the sum (M_1 + M_2 + ... + M_S).

Constraints

(1 \le T \le 50) (1 \le R, C \le 2{,}000{,}000) (R*C \le 2{,}000{,}000) (1 \le K \le R) (1 \le S \le 2{,}000{,}000) (G_{i,j} \in {)".", "X"(}) (1 \le A_i \le R) (1 \le B_i \le C)

The sum of (R*C + S) across all garages is at most (13{,}000{,}000).

Input

Input begins with an integer (T), the number of garages in which Shaun must consider clearing a path. For each garage, there is first a line containing (4) space-separated integers (R), (C), (K), and (S). Then, (R) lines follow, the (i)th of which contains the (C) characters (G_{i,1..C}). Finally, (S) lines follow, the (i)th of which contains (2) space-separated integers (A_i) and (B_i).

Output

For the (i)th garage, print a line containing "Case #i: " followed by a single integer, the sum (M_1 + M_2 + ... + M_S).

Sample Explanation

In the first garage, there is a single occupied space. Wong's first spell removes the car, after which the row is already cleared (i.e. (M_1 = 0)). After Wong's second spell refills the space, it would take a move of type #1 to clear the row ((M_2 = 1)). The answer is thus (0 + 1 = 1).

The second garage looks as follows after Wong's single spell, in which row (2) is already cleared and no moves are required:

  XXX
  ...
  XXX

The third garage looks as follows after Wong's single spell:

  XXX
  .X.
  XXX

One optimal strategy is for Shaun to use a move of type #1 to remove the car in row (1) and column (2), followed by a move of type #3 to shift all cars downwards, resulting in the following valid arrangement:

  ...
  XXX
  XXX

For the fourth garage, (M = [1, 2, 2, 1, 0]), and so the answer is (1 + 2 + 2 + 1 + 0 = 6).

For the sixth garage, (M = [5, 4, 4, 4, 3]).