#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, flag;
  char a;
  cin >> n >> m;
  flag = 0;
  getchar();
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++) {
      cin >> a;
      if (a != 'W' && a != 'B' && a != 'G') flag = 1;
    }
  if (flag)
    cout << "#Color" << endl;
  else
    cout << "#Black&White" << endl;
}
