#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b;
  cin >> a >> b;
  char Arr[a][b];
  for (int i = 0; i < a; i++) {
    for (int j = 0; j < b; j++) {
      cin >> Arr[i][j];
    }
  }
  int flag = 1;
  for (int i = 0; i < a; i++)
    for (int j = 0; j < b; j++)
      if (Arr[i][j] != 'W' && Arr[i][j] != 'B' && Arr[i][j] != 'G') {
        flag = 0;
        break;
      }
  if (flag == 1)
    cout << "#Black&White";
  else
    cout << "#Color";
}
