You are an expert competitive programmer. You will be given a problem statement, test case constraints and example test inputs and outputs. Please reason step by step about the solution (that must respect memory and time limits), then provide a complete implementation in c++17.

Your solution must read input from standard input (cin), write output to standard output (cout).
Do not include any debug prints or additional output.

Put your final solution within a single code block:
```cpp
<your code here>
```

Execution time limit: 7.0 seconds
Memory limit: 1024.0 MB

# Problem
This is the easy version of the problem. The only difference between the two versions are the allowed characters in $$$s$$$. In the easy version, $$$s$$$ only contains the character ?. You can make hacks only if both versions of the problem are solved.

You are given a permutation $$$p$$$ of length $$$n$$$. You are also given a string $$$s$$$ of length $$$n$$$, consisting only of the character ?.

For each $$$i$$$ from $$$1$$$ to $$$n$$$:

- Define $$$l_i$$$ as the largest index $$$j < i$$$ such that $$$p_j > p_i$$$. If there is no such index, $$$l_i := i$$$.
- Define $$$r_i$$$ as the smallest index $$$j > i$$$ such that $$$p_j > p_i$$$. If there is no such index, $$$r_i := i$$$.

Initially, you have an undirected graph with $$$n$$$ vertices (numbered from $$$1$$$ to $$$n$$$) and no edges. Then, for each $$$i$$$ from $$$1$$$ to $$$n$$$, add one edge to the graph:

- If $$$s_i =$$$ L, add the edge $$$(i, l_i)$$$ to the graph.
- If $$$s_i =$$$ R, add the edge $$$(i, r_i)$$$ to the graph.
- If $$$s_i =$$$ ?, either add the edge $$$(i, l_i)$$$ or the edge $$$(i, r_i)$$$ to the graph at your choice.

Find the maximum possible diameter$$$^{\text{∗}}$$$ over all connected graphs that you can form. Output $$$-1$$$ if it is not possible to form any connected graphs.

## Input Format
Each test contains multiple test cases. The first line of input contains a single integer $$$t$$$ ($$$1 \le t \le 2 \cdot 10^4$$$) — the number of test cases. The description of the test cases follows.

The first line of each test case contains a single integer $$$n$$$ ($$$2 \le n \le 4 \cdot 10^5$$$) — the length of the permutation $$$p$$$.

The second line of each test case contains $$$n$$$ integers $$$p_1,p_2,\ldots, p_n$$$ ($$$1 \le p_i \le n$$$) — the elements of $$$p$$$, which are guaranteed to form a permutation.

The third line of each test case contains a string $$$s$$$ of length $$$n$$$. It is guaranteed that it consists only of the character ?.

It is guaranteed that the sum of $$$n$$$ over all test cases does not exceed $$$4 \cdot 10^5$$$.

## Output Format
For each test case, output the maximum possible diameter over all connected graphs that you form, or $$$-1$$$ if it is not possible to form any connected graphs.

## Examples
```input
8
5
2 1 4 3 5
?????
2
1 2
??
3
3 1 2
???
7
5 3 1 6 4 2 7
???????
5
5 2 1 3 4
?????
6
6 2 3 4 5 1
??????
8
1 7 5 6 2 8 4 3
????????
12
6 10 7 1 8 5 12 2 11 3 4 9
????????????
```
```output
4
1
2
6
4
5
5
8
```

## Note
In the first test case, here are some possible connected graphs that you can form (the labels are indices):

In the second test case, the only connected graph has a diameter of $$$1$$$.

Now solve the problem and return the code.