#include <bits/stdc++.h>
using namespace std;
long long n, m;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> m;
  for (int i = 1; i <= n; i++)
    for (int i = 1; i <= m; i++) {
      char ch;
      cin >> ch;
      if (ch != 'W' && ch != 'B' && ch != 'G') {
        cout << "#Color";
        return 0;
      }
    }
  cout << "#Black&White";
  return 0;
}
