#include <bits/stdc++.h>
using namespace std;
int main() {
  int c = 0, m = 0, y = 0, w = 0, g = 0, b = 0, d, e;
  cin >> d >> e;
  char arr[d][e];
  for (int i = 0; i < d; i++) {
    for (int j = 0; j < e; j++) {
      cin >> arr[i][j];
      if (arr[i][j] == 'M') {
        m++;
      } else if (arr[i][j] == 'C') {
        c++;
      } else if (arr[i][j] == 'Y') {
        y++;
      } else if (arr[i][j] == 'W') {
        w++;
      } else if (arr[i][j] == 'G') {
        g++;
      } else if (arr[i][j] == 'B') {
        b++;
      }
    }
  }
  if (y == 0 && c == 0 && m == 0) {
    cout << "#Black&White";
  } else {
    cout << "#Color";
  }
  return 0;
}
