#include <bits/stdc++.h>
using namespace std;
int main() {
  long long i, j, k, l, n, m, t, p;
  p = 0;
  cin >> n;
  cin >> m;
  char c;
  for (i = 0; i <= n - 1; i++) {
    for (j = 0; j <= m - 1; j++) {
      cin >> c;
      if (c == 'C' || c == 'M' || c == 'Y') p = 1;
    }
  }
  if (p == 1)
    cout << "#Color";
  else
    cout << "#Black&White";
  return 0;
}
