#include <bits/stdc++.h>
using namespace std;
int main() {
  int m, n;
  cin >> n >> m;
  char a[n][m];
  int isb = 1;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> a[i][j];
      if (a[i][j] == 'C' || a[i][j] == 'M' || a[i][j] == 'Y') {
        isb = 0;
      }
    }
  }
  if (isb == 0) {
    cout << "#Color" << endl;
  } else {
    cout << "#Black&White" << endl;
  }
  return 0;
}
