CSES - HIIT Open 2016 - Graph painting
• Time limit: 1.00 s
• Memory limit: 256 MB

You are given a simple, undirected graph that consists of n nodes and m edges.

Your task is to paint each node red or blue so that there are at least \lfloor m/2 \rfloor edges such that their nodes have a different color.

# Input

The first input line contains an integer t: the number of test cases. After this, there are t test cases that are described as follows:

The first line contains two integers n and m: the number of nodes and edges in the graph. The nodes are numbered 1,2,\ldots,n.

After this, there are m lines that describe the edges. Each line contains two integers a and b. This means that there is an edge between nodes a and b.

# Output

For each test case, output a line that contains n space separated characters that describe the colors of the nodes. Each character must be R (red) or B (blue).

There is always a solution, and you can output any valid solution.

# Constraints

• 1 \le t \le 100
• 2 \le n \le 10^5
• 1 \le m \le 2 \cdot 10^5
• the sum of all n and m values it at most 10^6

# Example

Input:

3
2 1
1 2
4 4
1 2
2 3
3 4
1 4
5 3
1 2
1 3
1 4


Output:

R B
B B R B
R B B B B