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