#include <bits/stdc++.h>
using namespace std;
int n, m;
char c;
void Enter() {
  cin >> n >> m;
  for (int i = 1; i <= n; i++)
    for (int j = 1; j <= m; j++) {
      cin >> c;
      if (c == 'M' || c == 'Y' || c == 'C') {
        cout << "#Color";
        return;
      }
    }
  cout << "#Black&White";
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  Enter();
}
