Solve the programming task below in a Python markdown code block.
Chef has a string S of length N, consisting of +, -, and 0, where + denotes a source of positive charge, - denotes a source of negative charge, and 0 denotes a neutral object.

Each second, the charge sources emit their respective charge to their immediate neighbours. The charge emissions cannot affect other charge sources but can convert a neutral object into a charge source as following:
If an object was initially neutral, and had exactly one charged source as neighbour, it becomes a charged source as received by its neighbour.
If an object was initially neutral, and had no charged source as neighbour, it remains a neutral object.
If an object was initially neutral, and had both charged sources as neighbours, it becomes a charged source as received by its neighbours. Note that in case of neighbours with opposite charges, the object remains neutral.

For example, after one second, +0+ becomes +++, 00- becomes 0--, 000 remains 000 and +0- remains +0-. Refer to samples for further explanation.

Find out the number of neutral objects in the string after infinite time. 

------ Input Format ------ 

- The first line of input will contain a single integer T, denoting the number of test cases.
- Each test case consists of multiple lines of input.
- The first line of each test case contains an integer N — the number of objects.
- The next line contains a string S of length N, consisting of +, -, and 0, where + denotes a source of positive charge, - denotes a source of negative charge, and 0 denotes a neutral object.

------ Output Format ------ 

For each test case, output on a new line, the number of neutral objects in the string after infinite time. 

------ Constraints ------ 

$1 ≤ T ≤ 2000$
$1 ≤ N ≤ 10^{5}$
$S$ consists of +, -, and 0 only.
- The sum of $N$ over all test cases won't exceed $2\cdot 10^{5}$.

----- Sample Input 1 ------ 
4
2
00
3
-+0
6
00+-00
8
0-0+000-

----- Sample Output 1 ------ 
2
0
0
2

----- explanation 1 ------ 
Test case $1$: Since there is no charge source, both neutral objects will remain neutral.

Test case $2$: After $1$ second:
- The negative source emits a negative charge, but since there is no neutral neighbour for the negative source, it has no effect.
- The positive source emits a positive charge and since the neighbour to its right is neutral, the neutral object becomes a positive source.

Thus, the string becomes -++ after one second. Note that the string will remain the same after this and thus, it has no neutral objects after infinite time.

Test case $3$:
- After $1$ second, the string is 0++--0. Note that only the immediate neutral neighbours of charge sources have been affected.
- After $2$ seconds, the string is +++---. Since all objects are now charged sources, they will remain the same now onwards.

Thus, after infinite time, the string has no neutral objects.

Test case $4$: After $1$ second, the string is --0++0--. Note that the string will remain the same now onwards.

Thus, after infinite time, the string has $2$ neutral objects.