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