#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  int BW = 0, CLR = 0;
  char ink;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> ink;
      if (ink == 'B' || ink == 'W' || ink == 'G') {
        BW++;
      } else {
        CLR++;
      }
    }
  }
  if (BW == (n * m)) {
    cout << "#Black&White" << endl;
  } else {
    cout << "#Color" << endl;
  }
  return 0;
}
