#include <bits/stdc++.h>
using namespace std;
 
int main() {
	int t;
	cin >> t;
	while(t--)
	{
		int c=0,flag=0;
		char arr[8][8];
		for(int i=0;i<8;i++)
		{
			for(int j=0;j<8;j++)
			{
				cin >> arr[i][j];
				if(arr[i][j]=='R')
				{
					c++;
				}
				if(c==8)
				{
					flag = 1;
					break;
				}
			}
			c=0;
			if(flag==1)
			{
				break;
			}
		}
		if(flag == 1)
		{
			cout << "R" << endl;
		}
		else
		{
			cout << "B" << endl;
		}
 
	}
	return 0;
}

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MQouLkIuLi4uLgouLkIuLi4uLgouLkIuLi4uLgpSUkJSUlJSUgpSUlJSUlJSUgouLkIuLi4uLgpSUkJSUlJSUgouLkIuLi4uLg==

1
..B.....
..B.....
..B.....
RRBRRRRR
RRRRRRRR
..B.....
RRBRRRRR
..B.....