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