러시아 국기 같은 깃발_4613

import java.util.Scanner;

public class Solution {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		
		int T = sc.nextInt();
		
		for(int t = 0;t< T;t++) {
		
			int N = sc.nextInt();
			int M = sc.nextInt();
			
			char[][] arr = new char[N][M];
			
			for(int i = 0;i< N; i++) {
				String s = sc.next();
				for(int j = 0;j< M; j++) {
					arr[i][j] = s.charAt(j);
				}
			}
			
			int Min = Integer.MAX_VALUE;
			
			for(int i = 1;i<N-1;i++) {
				for(int j = i+1;j<N;j++){
					int Sum = 0;
					for(int w = 0;w<i;w++) 
						for(int k = 0;k<M;k++) 
							if(arr[w][k]!='W')
								Sum++;
					for(int b = i;b<j;b++)
						for(int k = 0;k<M;k++)
							if(arr[b][k]!='B')
								Sum++;
					for(int r = j;r<N;r++)
						for(int k = 0;k<M;k++)
							if(arr[r][k]!='R')
								Sum++;
					if(Min > Sum)
						Min = Sum;
				}
			}
			System.out.println("#" + (t + 1) + " " + Min);
		}
	}
}