#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, b = 1;
  char c;
  scanf("%d%d", &n, &m);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      getchar();
      scanf("%c", &c);
      if (c == 'C' || c == 'M' || c == 'Y') b = 0;
    }
  }
  if (b)
    printf("#Black&White\n");
  else
    printf("#Color\n");
  return 0;
}
