#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, color = 0;
  char c;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> c;
      if (c == 'C' || c == 'Y' || c == 'M') color = 1;
    }
  }
  (color == 1) ? cout << "#Color\n" : cout << "#Black&White\n";
  return 0;
}
