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