#include <bits/stdc++.h>
int n, m;
char row[300];
int main() {
  scanf("%d", &n);
  scanf("%d\n", &m);
  bool ans = false;
  for (int i = 0; i < n; ++i) {
    gets(row);
    for (int j = 0; j < m; ++j) {
      if (row[2 * j] == 'C' || row[2 * j] == 'M' || row[2 * j] == 'Y') {
        ans = true;
      }
    }
  }
  if (ans) {
    printf("#Color");
  } else {
    printf("#Black&White");
  }
}
