#include <bits/stdc++.h>
using namespace std;
const long long inf = 0x3f3f3f3f3f3f3f3f;
const double pi = acos(-1.0);
int n, m;
char s[10005][5];
int main() {
  while (scanf("%d%d", &n, &m) != EOF) {
    for (int i = 0; i < n * m; i++) scanf("%s", s[i]);
    int flag = 0;
    for (int i = 0; i < n * m; i++) {
      if (s[i][0] == 'C' || s[i][0] == 'M' || s[i][0] == 'Y') flag = 1;
    }
    if (flag == 1)
      printf("#Color\n");
    else
      printf("#Black&White\n");
  }
  return 0;
}
