#include <bits/stdc++.h>
using std::cin;
using std::cout;
using std::string;
int main() {
  int r, c;
  cin >> r >> c;
  for (int i{}; i < r * c; i++) {
    string ch{};
    cin >> ch;
    if (ch == "C" || ch == "M" || ch == "Y") {
      cout << "#Color";
      return 0;
    }
  }
  cout << "#Black&White";
}
