#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9;
const int maxN = 100000;
int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  int n, m;
  cin >> n >> m;
  int ok = 1;
  for (int i = 0; i < n; i++) {
    for (int k = 0; k < m; k++) {
      char c;
      cin >> c;
      if (c != 'B' && c != 'W' && c != 'G') ok = 0;
    }
  }
  cout << (ok ? "#Black&White" : "#Color") << endl;
  return 0;
}
