#include <bits/stdc++.h>
using namespace std;
const int maxn = 110;
const int inf = 0x3f3f3f3f;
int n, m, N, t;
char ch[maxn][maxn];
int main() {
  int flag = 0;
  scanf("%d %d", &n, &m);
  for (int i = 1; i <= n; ++i) {
    for (int j = 1; j <= m; ++j) {
      cin >> ch[i][j];
      if (ch[i][j] == 'C' || ch[i][j] == 'M' || ch[i][j] == 'Y') flag = 1;
    }
  }
  if (flag)
    printf("#Color\n");
  else
    printf("#Black&White\n");
  return 0;
}
