#include <bits/stdc++.h>
int main() {
  int x, y, a, b;
  char s[250];
  while (scanf("%d%d", &x, &y) != EOF) {
    getchar();
    int flag = 0;
    for (int i = 0; i < x; i++) {
      gets(s);
      if (!flag) {
        for (int j = 0; j < strlen(s); j++) {
          if (s[j] == 'C' || s[j] == 'M' || s[j] == 'Y') {
            flag = 1;
            break;
          }
        }
      }
    }
    if (flag)
      printf("#Color\n");
    else
      printf("#Black&White\n");
  }
}
