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