#include <bits/stdc++.h>
int main() {
  int n, m, i, ind = 0;
  char pixel[2];
  scanf("%d%d", &n, &m);
  for (; n > 0; n--) {
    for (i = 0; i < m; i++) {
      scanf("%s", pixel);
      if (pixel[0] != 'B' && pixel[0] != 'W' && pixel[0] != 'G') {
        ind = 1;
      }
    }
  }
  if (ind == 1) {
    printf("#Color");
  } else {
    printf("#Black&White");
  }
  return 0;
}
