#include <bits/stdc++.h>
using namespace std;
char Map[1000][1000];
int n, m;
bool judge() {
  int i, j;
  for (i = 0; i < n; ++i) {
    for (j = 0; j < strlen(Map[i]); j += 2) {
      if (Map[i][j] != 'W' && Map[i][j] != 'B' && Map[i][j] != 'G')
        return false;
    }
  }
  return true;
}
int main() {
  while (scanf("%d%d", &n, &m) != EOF) {
    getchar();
    int i, j;
    for (i = 0; i < n; ++i) gets(Map[i]);
    if (judge())
      printf("#Black&White\n");
    else
      printf("#Color\n");
  }
  return 0;
}
