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