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