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