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