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