#include <iostream>
#include <string>

using namespace std;

int main() {

  string a,b;
  cin >> a >> b;
  int count = a.size();
  for (int i = 0; i < count; i++) {
    char c = a[i];
    if (b.find(c) == string::npos) {
      cout << "NO" << "\n";
      break;
    }
  }

  return 0;
}