#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b;
  cin >> a >> b;
  bool color = false;
  string value;
  for (int i = 0; i < a; i++) {
    for (int j = 0; j < b; j++) {
      cin >> value;
      if (value == "C" || value == "M" || value == "Y") {
        color = true;
        break;
      }
    }
    if (color == true) {
      break;
    }
  }
  if (!color) {
    cout << "#Black&White";
  } else {
    cout << "#Color";
  }
  return 0;
}
