#include <bits/stdc++.h>
using namespace std;
long long a, b, c, d, e, f, g, h, ifCol;
long long n, m;
char grid[109][109];
int main() {
  cin >> n >> m;
  for (a = 1; a <= n; a++) {
    for (b = 1; b <= m; b++) {
      cin >> grid[a][b];
      if (grid[a][b] == 'C' || grid[a][b] == 'M' || grid[a][b] == 'Y')
        ifCol = 1;
    }
  }
  if (ifCol)
    cout << "#Color";
  else
    cout << "#Black&White";
  return 0;
}
