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