#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, j, c, m;
  cin >> n >> m;
  char a[n][m];
  set<char> s;
  set<char>::iterator itr;
  for (i = 0; i < n; i++) {
    for (j = 0; j < m; j++) {
      cin >> a[i][j];
      s.insert(a[i][j]);
    }
  }
  int check = 0;
  char ch;
  for (itr = s.begin(); itr != s.end(); itr++) {
    ch = *itr;
    if (ch != 'W' && ch != 'B' && ch != 'G') {
      check++;
      break;
    }
  }
  if (check == 0) {
    cout << "#Black&White" << endl;
  } else {
    cout << "#Color" << endl;
  }
}
