//707A : BRAIN'S PHOTOS

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;

//Your code goes here
public class Main {

    static class ProblemSolver{
        public void solveTheProblem(InputReader in,PrintWriter out){

            /*
             * This is a very simple adhoc question
             * involving only character matching
             */

            //User inputs and other variables
            int row=in.nextInt();
            int col=in.nextInt();
            int total=row*col;
            String[] pixels=new String[total];
            boolean color=false;
            for(int i=0;i<total;++i)pixels[i]=in.next();

            //Evaluation of expression
            for(int i=0;i<total;++i){
                if(pixels[i].equals("C") || pixels[i].equals("M") || pixels[i].equals("Y")){
                    color=true;
                    break;
                }
            }

            //Displaying the result
            if(color)System.out.println("#Color");
            else System.out.println("#Black&White");



        }
    }

    //Default template for all the codes
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream),32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }

    //Main method for all the codes
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        ProblemSolver problemSolver = new ProblemSolver();
        problemSolver.solveTheProblem(in, out);
        out.close();
    }

}