#include <bits/stdc++.h>
using namespace std;

const int N = 12;
int MaxCurrentPasses = 0;

void Pass(int x, int y, vector < vector <int> > &CheckersField, int PassCounter)
{
    if( CheckersField[x+1][y+1] == -1 && CheckersField[x+2][y+2] == 0)
    {
        PassCounter++;
        MaxCurrentPasses=max(MaxCurrentPasses,PassCounter);
        CheckersField[x+1][y+1] = 0;
        Pass(x+2,y+2,CheckersField,PassCounter);
        CheckersField[x+1][y+2];
    }
        if(CheckersField[x+1][y-1] == -1 && CheckersField[x+2][y-2] == 0)
    {
        PassCounter++;
        MaxCurrentPasses=max(MaxCurrentPasses,PassCounter);
        CheckersField[x+1][y-1] = 0;
        Pass(x+2,y-2,CheckersField,PassCounter);
        CheckersField[x+1][y-2];
    }
        if(CheckersField[x-1][y-1] == -1 && CheckersField[x-2][y-2] == 0)
    {
        PassCounter++;
        MaxCurrentPasses=max(MaxCurrentPasses,PassCounter);
        CheckersField[x-1][y-1] = 0;
        Pass(x-2,y-2,CheckersField,PassCounter);
        CheckersField[x-1][y-2];
    }
        if(CheckersField[x-1][y+1] == -1 && CheckersField[x-2][y+2] == 0)
    {
        PassCounter++;
        MaxCurrentPasses=max(MaxCurrentPasses,PassCounter);
        CheckersField[x-1][y+1] = 0;
        Pass(x-2,y+2,CheckersField,PassCounter);
        CheckersField[x-1][y+2];
    }
    PassCounter--;
}
int main()
{
    int Set;
    cin>>Set;
    while(Set--)
    {
        vector < vector <int> > CheckersField(N, vector<int>(N,-2));
        vector <pair <int, int> > WhitePawnCoOrdinates;
        for(int i=0;i<N-2;i++)
        {
            for(int j=0;j<N-2;j++)
            {
                char square;
                cin>>square;
                if(square == '.' || square == '#')
                    CheckersField[i][j] = 0;
                if(square == 'W')
                {
                    CheckersField[i][j] = 1;
                    WhitePawnCoOrdinates.push_back(make_pair(i,j));
                }
                if(square == 'B')
                    CheckersField[i][j] = -1;
            }
        }

        for(int i=0;i<WhitePawnCoOrdinates.size();i++)
        {
        int x = WhitePawnCoOrdinates[i].first;
        int y = WhitePawnCoOrdinates[i].second;
        Pass(x+1,y+1, CheckersField,0);
        }
        cout<<MaxCurrentPasses<<endl;
        MaxCurrentPasses = 0;
    }
}