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