#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  char matrix[n][m];
  bool color = false;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> matrix[i][j];
      color = color || (matrix[i][j] != 'W' && matrix[i][j] != 'B' &&
                        matrix[i][j] != 'G');
    }
  }
  if (color) {
    cout << "#Color";
  } else {
    cout << "#Black&White";
  }
}
