#include <bits/stdc++.h>
using namespace std;
int main() {
  int flag = 0;
  int n, m;
  char x;
  cin >> n >> m;
  int k = n * m;
  while (k >= 1) {
    cin >> x;
    if (x == 'C' || x == 'Y' || x == 'M') {
      flag = 1;
    }
    k--;
  }
  if (flag == 1)
    cout << "#Color" << endl;
  else
    cout << "#Black&White" << endl;
}
