#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> m >> n;
  char arr[n][m];
  int bAndW = 0, coloured = 0;
  for (int i = 0; i < m; i++) {
    for (int j = 0; j < n; j++) {
      cin >> arr[i][j];
      char c = arr[i][j];
      if (c == 'W' || c == 'B' || c == 'G')
        bAndW = 1;
      else
        coloured = 1;
    }
  }
  if (coloured == 1)
    cout << "#Color";
  else
    cout << "#Black&White";
  return 0;
}
