#include <bits/stdc++.h>
int main() {
  int n, m, i;
  scanf("%d %d", &n, &m);
  char s[5];
  int flag = 0;
  m = m * n;
  for (i = 0; i < m; i++) {
    scanf("%s", &s);
    if (s[0] == 'C' || s[0] == 'M' || s[0] == 'Y') {
      flag = 1;
    }
  }
  if (flag == 0)
    printf("#Black&White\n");
  else
    printf("#Color\n");
  return 0;
}
