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