#include <bits/stdc++.h>
using namespace std;
int main() {
  int m, n, i, j;
  char c;
  cin >> m >> n;
  for (i = 0; i < m; i++) {
    for (j = 0; j < n; j++) {
      cin >> c;
      if (c == 'M' || c == 'Y' || c == 'C') {
        cout << "#Color";
        return 0;
      }
    }
  }
  cout << "#Black&White";
}
