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