#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  scanf("%d%d\n", &n, &m);
  while (n--) {
    string s;
    getline(cin, s);
    for (char c : s)
      if (c != ' ' && c != 'B' && c != 'W' && c != 'G') {
        printf("#Color");
        return 0;
      }
  }
  printf("#Black&White");
}
