#include <bits/stdc++.h>
using namespace std;
void solve() {
  const string bw = "#Black&White";
  const string color = "#Color";
  int rows, cols;
  cin >> rows >> cols;
  for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
      char c;
      cin >> c;
      if (c == 'C' || c == 'M' || c == 'Y') {
        cout << color;
        return;
      }
    }
  }
  cout << bw;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  solve();
  return 0;
}
