#include <bits/stdc++.h>
using namespace std;
int main() {
  char s[101];
  int n, m, count = 0;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> s[i];
      if (s[i] == 'W' || s[i] == 'B' || s[i] == 'G') {
        count++;
      }
    }
  }
  if (count == n * m) {
    cout << "#Black&White";
  } else
    cout << "#Color";
}
