#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  int n, m;
  cin >> n >> m;
  char c;
  bool flag = false;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> c;
      if (c == 'C' or c == 'M' or c == 'Y') flag = true;
    }
  }
  if (flag)
    cout << "#Color";
  else
    cout << "#Black&White";
  return 0;
}
