#include <bits/stdc++.h>
using namespace std;
char a[101][101];
int n, m;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> a[i][j];
    }
  }
  int f = 0;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      if (a[i][j] == 'C' || a[i][j] == 'M' || a[i][j] == 'Y') {
        f = 1;
        break;
      }
    }
  }
  if (!f) {
    cout << "#Black&White\n";
  } else {
    cout << "#Color\n";
  }
}
