#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  char c;
  bool bw = true;
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      cin >> c;
      if (c != 'W' && c != 'B' && c != 'G') bw = false;
    }
  }
  if (bw)
    cout << "#Black&White";
  else
    cout << "#Color";
  return 0;
}
