#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  char a[110][110];
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> a[i][j];
    }
  }
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      if (a[i][j] != 'W' && a[i][j] != 'B' && a[i][j] != 'G') {
        cout << "#Color" << endl;
        return 0;
      }
    }
  }
  cout << "#Black&White" << endl;
  return 0;
}
