#include <bits/stdc++.h>
using namespace std;
int n, m, t;
char c;
int main() {
  scanf("%d%d", &n, &m);
  for (int i = 1; i <= n; ++i)
    for (int j = 1; j <= m; ++j) {
      scanf("%c", &c);
      while (!((c >= 'A') && (c <= 'Z'))) scanf("%c", &c);
      if (c == 'C' || c == 'M' || c == 'Y') {
        t = 1;
        break;
      }
    }
  if (t == 0)
    printf("#Black&White");
  else
    printf("#Color");
}
