#include <bits/stdc++.h>
using namespace std;
char c;
int a, b, color;
int main() {
  cin >> a >> b;
  for (int i = 0; i < a; i++) {
    for (int j = 0; j < b; j++) {
      cin >> c;
      if (c == 'C' || c == 'M' || c == 'Y') {
        color = 1;
        break;
      }
    }
    if (color == 1) {
      break;
    }
  }
  if (color == 1) {
    cout << "#Color";
  } else {
    cout << "#Black&White";
  }
}
