#include <bits/stdc++.h>
using namespace std;
int main(int argc, char *argv[]) {
  int n, m;
  cin >> n >> m;
  for (int i = 0; i < n; ++i) {
    for (auto j = 0; j < m; ++j) {
      char c;
      cin >> c;
      if (c != 'B' && c != 'G' && c != 'W') {
        cout << "#Color" << endl;
        return 0;
      }
    }
  }
  cout << "#Black&White" << endl;
  return 0;
}
