#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  int flag = 0;
  char a[n][m];
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> a[i][j];
      if (a[i][j] != 'B' && a[i][j] != 'W' && a[i][j] != 'G') {
        flag = 1;
        break;
      }
    }
    if (flag == 1) break;
  }
  if (flag == 1) {
    cout << "#Color";
  } else {
    cout << "#Black&White";
  }
}
