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