#include <iostream>
using namespace std;
 
int main() {
  bool q;
  int n, m, c = 0, arr1[101], arr2[101], arr3[101];
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> arr1[i];
  }
  cin >> m;
  for (int i = 0; i < m; i++) {
    cin >> arr2[i];
  }
  for (int i = 0; i < n; i++) {
    q = false;
    for (int j = 0; j < m; j++)
      if (arr1[i] == arr2[j]) q = true;
    if (q == false) {
      arr3[c] = arr1[i];
      c++;
    }
  }
  cout << c << endl;
  for (int i = 0; i < c - 1; i++) {
    cout << arr3[i] << " ";
  }
  cout << arr3[c - 1];
  return 0;
}

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MTAKMTUgNDcgNjggNTkgNzUgMjUgMzUgNjEgMjEgODYKMTAKMTUgNDcgNjkgNTggNzUgMjYgMzYgNjEgMjEgODk=

10
15 47 68 59 75 25 35 61 21 86
10
15 47 69 58 75 26 36 61 21 89