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