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