#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, i, j, cnt = 0, p = 0;
  scanf("%d%d", &n, &m);
  char s[n][m];
  for (i = 0; i < n; i++) {
    for (j = 0; j < m; j++) {
      cin >> s[i][j];
    }
  }
  for (i = 0; i < n; i++) {
    for (j = 0; j < m; j++) {
      if (s[i][j] == 'C' || s[i][j] == 'M' || s[i][j] == 'Y') {
        cnt++;
      } else {
        p++;
      }
    }
  }
  if (cnt >= 1) {
    printf("#Color\n");
  } else {
    printf("#Black&White\n");
  }
}
