#include <bits/stdc++.h>
using namespace std;
int main() {
  long a, b;
  char c;
  cin >> a >> b;
  for (int i = 0; i < a * b; i++) {
    cin >> c;
    if (c != 'W' && c != 'B' && c != 'G') {
      cout << "#Color";
      return 0;
    }
  }
  cout << "#Black&White";
}
