#include <bits/stdc++.h>
using namespace std;
int main() {
  char c;
  int x, y, a = 0;
  cin >> x >> y;
  for (int i = 0; i < x * y; i++) {
    cin >> c;
    if (c == 'B' || c == 'G' || c == 'W') a++;
  }
  if (a == x * y)
    cout << "#Black&White" << endl;
  else
    cout << "#Color" << endl;
}
