#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, k;
  cin >> n >> k;
  bool flag = false;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < k; j++) {
      char x;
      cin >> x;
      if (x == 'C' || x == 'M' || x == 'Y') flag = true;
    }
  }
  if (flag)
    cout << "#Color" << endl;
  else
    cout << "#Black&White" << endl;
  return 0;
}
