#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, res = 0;
  char c;
  scanf("%d %d", &n, &m);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      scanf(" %c", &c);
      if (c != 'B' && c != 'W' && c != 'G') res = 1;
    }
  }
  if (res == 1)
    printf("#Color\n");
  else
    printf("#Black&White\n");
}
