#include <bits/stdc++.h>
std::string int_to_str(int x) {
  std::ostringstream ss;
  ss << x;
  return ss.str();
}
int main() {
  int n, m;
  bool wbg = true;
  std::cin >> n >> m;
  char a[n][m];
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      std::cin >> a[i][j];
    }
  }
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      if (a[i][j] == 'C' || a[i][j] == 'M' || a[i][j] == 'Y') {
        wbg = false;
        break;
      }
    }
    if (!wbg) break;
  }
  if (wbg)
    std::cout << "#Black&White";
  else
    std::cout << "#Color";
  return 0;
}
